[clang] [clang] perf_helper.py ignore clang warning/note when parsing cc1 command (PR #212401)

[Henry Jiang via cfe-commits]

mustartt 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/46890
> 
> Here is the relevant piece of the build log for the reference

Unrelated.

https://github.com/llvm/llvm-project/pull/212401