[compiler-rt] [asan] Add experimental 'poison_history_size' flag (PR #133175)

[Nico Weber via llvm-commits]

nico wrote:

https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA/4113/ has been red since this landed. Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/133175