[llvm] [CI] Add precommit CIs to test compiler-rt + LLVM libc integration. (PR #200196)

[via llvm-commits]

lntue wrote:

> I'm overall not a huge fan of GHA provided premerge CI for this sort of niche use, but I guess this is how the rest of the libc CI also works, so it's probably not a big deal to do it this way.

Sorry for adding this, but this will help to prevent regression while we are developing this feature.  Once we can make it default for compiler-rt, we could turn down this precommit CI and just use the current compiler-rt's CIs.

https://github.com/llvm/llvm-project/pull/200196