[compiler-rt] Add API to temporalily disable usage of ASAN's fake stack (PR #160135)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> For 2., since __asan_disable_fake_stack()/__asan_enable_fake_stack() is a runtime API, it is debatable why it can't

The point of '=2' is to change Asan pass to generate code which does not check for nullptr.

Regarding documentation, In this header yes, in Clang docs, better not yet.





https://github.com/llvm/llvm-project/pull/160135