[clang] [llvm] [Sanitizer] Make sanitizer passes idempotent (PR #99439)

[Fangrui Song via llvm-commits]

MaskRay wrote:

I am still nervous as newer instrumentations might all need to know about the special property.
Is it useful to restrict this to HIP programs, at least before we gain more experience to comfortably apply this to other configurations?

I do worry that such a change will cause us not to notice pass pipeline issues due to double instrumentations.


https://github.com/llvm/llvm-project/pull/99439