[llvm-branch-commits] [compiler-rt] release/19.x: Reapply "[sanitizer_common] AND signals in BlockSignals instead of deleting (#113443)" for non-Android Linux only (#115790) (PR #116670)

[Thurston Dang via llvm-branch-commits]

thurstond wrote:

> @thurstond (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.

Fixes a regression whereby the sanitizers may incorrectly unblock signals that had been blocked by the user.

https://github.com/llvm/llvm-project/pull/116670