Update LLVM submodule
This is a rebase to LLVM 15.0.6.
Fixes #103380.
Fixes #104099.
[submodule "src/llvm-project"]
path = src/llvm-project
url = https://github.com/rust-lang/llvm-project.git
- branch = rustc/15.0-2022-08-09
+ branch = rustc/15.0-2022-12-07
[submodule "src/doc/embedded-book"]
path = src/doc/embedded-book
url = https://github.com/rust-embedded/book.git
-Subproject commit a1232c451fc27173f8718e05d174b2503ca0b607
+Subproject commit 3dfd4d93fa013e1c0578d3ceac5c8f4ebba4b6ec