[clang] [Frontend][PCH]-Add support for ignoring PCH options (-ignore-pch). (PR #142409)

[Ying Yi via cfe-commits]

MaggieYingYi wrote:

> LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-4` while building `clang` at step 6 "test-build-unified-tree-check-all".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/21187
> 

I am reproducing the failure in my local machine.



https://github.com/llvm/llvm-project/pull/142409