[llvm-branch-commits] [clang] release/23.x: [clang][lex] Cache stat failures in `-Wshadow-header` (#215962) (PR #216116)

[via llvm-branch-commits]

llvmbot wrote:

@cor3ntin @cyndyishida What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/216116