Auto merge of #73830 - Manishearth:rollup-8k68ysm, r=Manishearth

Rollup of 10 pull requests

Successful merges:

 - #72796 (MIR sanity check: validate types on assignment)
 - #73243 (Add documentation to point to `File::open` or `OpenOptions::open` instead of `is_file` to check read/write possibility)
 - #73525 (Prepare for LLVM 11)
 - #73672 (Adds a clearer message for when the async keyword is missing from a f…)
 - #73708 (Explain move errors that occur due to method calls involving `self` (take two))
 - #73758 (improper_ctypes: fix remaining `Reveal:All`)
 - #73763 (errors: use `-Z terminal-width` in JSON emitter)
 - #73796 (replace more `DefId`s with `LocalDefId`)
 - #73797 (fix typo in self-profile.md)
 - #73809 (Add links to fs::DirEntry::metadata)

Failed merges:

r? @ghost