[clang] [clang-tools-extra] [llvm] [LLVM][CLANG] Update signal-handling behavior to comply with POSIX (PR #169340)

[Xing Xue via cfe-commits]

xingxue-ibm wrote:

@hnrklssn Thanks for letting us know. We’re looking into the issue.

https://github.com/llvm/llvm-project/pull/169340