[clang] [llvm] [TySan][Clang] Add clang flag to use tysan outlined instrumentation a… (PR #166170)

[Matthew Nagy via cfe-commits]

gbMattN wrote:

Sorry, it appears I have two local copies of llvm on my computer and pushed the wrong one. All changes should be restored now 😅

https://github.com/llvm/llvm-project/pull/166170