Don't disable inline asm in hint::spin_loop

Merge pull request #916 from bjorn3/fn_once_for_box_without_alloca

Emulate `<Box<F> as FnOnce>::call_once` without `alloca`

Don't disable multithreading in libtest

Rustup to rustc 1.43.0-nightly (3dbade652 2020-03-09)

Emulate `<Box<F> as FnOnce>::call_once` without `alloca`

Fixes #884

cc #15

Support virtual calls with unsized self argument

Bump proc-macro2 from 1.0.8 to 1.0.9 (#908)

Bumps [proc-macro2](https://github.com/alexcrichton/proc-macro2) from 1.0.8 to 1.0.9.
- [Release notes](https://github.com/alexcrichton/proc-macro2/releases)
- [Commits](https://github.com/alexcrichton/proc-macro2/compare/1.0.8...1.0.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Bump syn from 1.0.15 to 1.0.16 (#907)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.15 to 1.0.16.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.15...1.0.16)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Bump quote from 1.0.2 to 1.0.3 (#912)

Bumps [quote](https://github.com/dtolnay/quote) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/dtolnay/quote/releases)
- [Commits](https://github.com/dtolnay/quote/compare/1.0.2...1.0.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Use multiple codegen units

Fixes #909

Merge pull request #913 from bjorn3/dependabot/cargo/cranelift-codegen-fbe29da

Bump cranelift-codegen from `4284491` to `fbe29da`

Bumps [cranelift-codegen](https://github.com/bytecodealliance/wasmtime) from `4284491` to `fbe29da`.
- [Release notes](https://github.com/bytecodealliance/wasmtime/releases)
- [Commits](https://github.com/bytecodealliance/wasmtime/compare/428449133943213f2edc58ec161efcbb23d0eebd...fbe29da5cc1c0847af176f151f114a6a535534ff)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Revert "Use multiple codegen units"

This reverts commit 03acf67a0e3a2780d2a1443f4e4596b69d9a2b09.

Fix Cranelift patch paths

Use multiple codegen units

Move emit_module call

Move time "codegen mono items" out of codegen_mono_items

Check for main in current module before codegen of entry wrapper

Inline codegen_cgus

Misc changes

Update Cranelift

Remove unused inline asm whitelist

Don't run dsymutil on librustc_codegen_cranelift on macOS

This halves clean incremental compilation time

Rustup to rustc 1.43.0-nightly (2890b37b8 2020-03-06)

Rustup to rustc 1.43.0-nightly (4ad624882 2020-03-03)

Update for the merge of Cranelift into Wasmtime

Rustup to rustc 1.43.0-nightly (0eb878d2a 2020-02-28)

Implement simd_fma

Merge pull request #784 from bjorn3/wip_tls_support

TLS support

Tls support

Rustup to rustc 1.43.0-nightly (6fd8798f4 2020-02-25)

Merge pull request #903 from bjorn3/dependabot/cargo/cranelift-codegen-5ad5505

Bump cranelift-codegen from `0c7da4a` to `5ad5505`

Bumps [cranelift-codegen](https://github.com/bytecodealliance/cranelift) from `0c7da4a` to `5ad5505`.
- [Release notes](https://github.com/bytecodealliance/cranelift/releases)
- [Commits](https://github.com/bytecodealliance/cranelift/compare/0c7da4a66325b82423111927b0d701e9a09269a6...5ad55057f18652ad0a4f270cd9b2876eb051c7d0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fix JIT on macOS

Fixes #671

Silence some warnings

Update dependencies

Update Cranelift

Rustup to rustc 1.43.0-nightly (8aa9d2014 2020-02-21)

Bump thiserror from 1.0.10 to 1.0.11 (#894)

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.10 to 1.0.11.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](https://github.com/dtolnay/thiserror/compare/1.0.10...1.0.11)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #896 from bjorn3/dependabot/cargo/cranelift-codegen-cd3d84e

Bump cranelift-codegen from `f1aa072` to `cd3d84e`

Bumps [cranelift-codegen](https://github.com/bytecodealliance/cranelift) from `f1aa072` to `cd3d84e`.
- [Release notes](https://github.com/bytecodealliance/cranelift/releases)
- [Commits](https://github.com/bytecodealliance/cranelift/compare/f1aa07265b3b25c1859f7184e92fd600316b4b25...cd3d84e580cc69876a93ea87ef12d45ee2942b2d)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Update Cranelift and use the new ineg instruction

Use archive_format for determining if gnu style archives should be emitted

Fixes #893

Update dependencies

Update Cranelift for basic blocks

Rustup to rustc 1.43.0-nightly (5d04ce67f 2020-02-13)

Use TrapCode::UnreachableCodeReached in trap_unreachable

[OPT] Don't call monomorphize from clif_type

Remove the sudo key from .travis.yml

It has been deprecated and doesn't have any effect anymore

Rustup to rustc 1.43.0-nightly (442ae7f04 2020-02-06)

Revert "Use CachingSourceMapView::byte_pos_to_line_and_col instead of SourceMap::lookup_char_pos"

This reverts commit eb4fc45310c70513d73d893616cd6735465680ca.

It caused a panic while compiling simple-raytracer

Use CachingSourceMapView::byte_pos_to_line_and_col instead of SourceMap::lookup_char_pos

The former calculates byte offsets instead of char offsets. It is faster
to calculate byte offsets than char offsets. Also most DWARF producers
and consumers use byte offsets instead of char offsets.

Don't mark unwind ebbs as cold

This fixes the code_layout optimization, as it would previously try to
move non-existing ebbs.

Fixes #877

Update smallvec to 1.2.0

Rustup to rustc 1.42.0-nightly (cd1ef390e 2020-01-31)

Update thiserror

Update Cranelift

Rustup to rustc 1.42.0-nightly (3761dcd34 2020-01-28)

Merge pull request #883 from bjorn3/dependabot/cargo/cranelift-codegen-9a578c1

Bump cranelift-codegen from `93e3bc1` to `9a578c1`

Bumps [cranelift-codegen](https://github.com/bytecodealliance/cranelift) from `93e3bc1` to `9a578c1`.
- [Release notes](https://github.com/bytecodealliance/cranelift/releases)
- [Commits](https://github.com/bytecodealliance/cranelift/compare/93e3bc19985d0be2d0bfb7bcf990139c4a95358d...9a578c10924ce485a7b7e22dd5577ebc96538bb0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Disable the code_layout optimization

When compiling libcore, it causes ebb params to be dropped for a certain function

Add #[cfg(debug_assertions)] to write_clif_file

This silences a warning in release mode

Update compiler_builtins

Replace unimplemented! with unreachable! when it will never be supported

Fix correctness of optimization

Allow unsized types as function parameters

Remove outdated troubleshooting section

The nightly version is pinned since recently

Rustup to rustc 1.42.0-nightly (c2d141df5 2020-01-24)

Re-introduce FnBox

Improve PlaceElem::Subslice handling

Make atomic instructions atomic using a global lock

Warn when using LTO

Make unused stack slots zero sized in stack2reg

Don't force static refs to const memory

Allow more types in CValue::const_val

Rustup to rustc 1.42.0-nightly (689fca01c 2020-01-17)

Update dependencies

Update Cranelift

As basic blocks now work, they are enabled.

Merge pull request #872 from bjorn3/dependabot/cargo/cranelift-codegen-062e984

Bump cranelift-codegen from `3268b0d` to `062e984`

Bumps [cranelift-codegen](https://github.com/bytecodealliance/cranelift) from `3268b0d` to `062e984`.
- [Release notes](https://github.com/bytecodealliance/cranelift/releases)
- [Commits](https://github.com/bytecodealliance/cranelift/compare/3268b0d11f6646b95e250d9f5eba22756434bcef...062e984cddb39bfe41f3abcb4653e76670960a69)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Correct commit message in rustup.sh

rustc 1.42.0-nightly (31dd4f4ac 2020-01-13)

Add rustup script

Display warning when overriding default rustc version in cargo.sh

Store nightly snapshot in rust-toolchain file, and use it in cargo.sh

The rust-toolchain file can also store an exact nightly snapshot
(instead of just "nightly"), so we can store whatever snapshot that
rustc_codegen_cranelift is known to work with.

This also lets us add a new feature to `cargo.sh` to let it use the
exact same nightly snapshot as cg_clif.  If there's a nightly compiler
mismatch, you get a confusing error message like:

    error: couldn't load codegen backend "librustc_codegen_cranelift.so":
    "librustc_driver-681e2b4f66c73d3e.so: cannot open
    shared object file: No such file or directory"

So doing this automatically in cargo.sh is useful.

Fix debug build

Reduce the amount of calls to layout_of

Use release mode instead of debug mode in the readme

cc #865

Reduce visibility

Optimize .debug_line generation

This reduces the amount of time spent in .debug_line generation by about 50%

Fixes #807

Update gimli to 0.20.0

Remove some depencencies

Update Cranelift

Rustup to rustc 1.42.0-nightly (3ebcfa145 2020-01-12)

Move all cold code to the end of the function

Fixes #836

Benchmark #1: simple-raytracer/raytracer_cg_clif
  Time (mean ± σ):      9.250 s ±  0.056 s    [User: 9.213 s, System: 0.015 s]
  Range (min … max):    9.151 s …  9.348 s    20 runs

Benchmark #2: simple-raytracer/raytracer_cg_clif_cold_separated
  Time (mean ± σ):      9.179 s ±  0.101 s    [User: 9.141 s, System: 0.016 s]
  Range (min … max):    9.070 s …  9.473 s    20 runs

Summary
  'simple-raytracer/raytracer_cg_clif_cold_separated' ran
    1.01 ± 0.01 times faster than 'simple-raytracer/raytracer_cg_clif'

Implement `#[track_caller]`

Fixes #848

Don't panic on reported const eval errors

Fix PlaceElem::Subslice length computation

Fix build

Improve build time for build scripts in release mode