[compiler-rt] [compiler-rt][asan] Fix for flaky asan check (PR #88177)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

On https://reviews.llvm.org/D158786 I didn't realized that it's not thread safe, it should be easy to make `LowLevelAllocator` thread safe.

Feel free just to add TODO, or we can do thread safe in this patch?


https://github.com/llvm/llvm-project/pull/88177