[clang][ptrauth] Make ptrauth feature detection tests more robust#136204

ojhunt merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

swiftlang:users/ojhunt/robustify-ptrauth-feature-detection-testswiftlang/llvm-project:users/ojhunt/robustify-ptrauth-feature-detection-testCopy head branch name to clipboard