[clang] Reapply "[C++20][Modules] Implement P1857R3 Modules Dependency Discovery" (PR #173130)

[via cfe-commits]

yronglin wrote:

> LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-hwasan` running on `sanitizer-buildbot11` while building `clang` at step 2 "annotate".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/55/builds/21886
> 
> Here is the relevant piece of the build log for the reference

This seems related.

https://github.com/llvm/llvm-project/pull/173130