[clang] [llvm] [clang] Support ASan on WASI (PR #139014)

[Derek Schuff via llvm-commits]

dschuff wrote:

This looks good to me, @sbc100 and @sunfishcode might also be interested (presumably the sanitizer runtime will end up alongside wasi-libc in the wasi SDK?)

https://github.com/llvm/llvm-project/pull/139014