[clang] [compiler-rt] [lld] [llvm] [Coverage][WebAssembly] Add initial support for WebAssembly/WASI (PR #111332)

[Zequan Wu via cfe-commits]

ZequanWu wrote:

Oh, I see, there are windows version of `flock` in `WindowsMMap.h`, and this new macro `COMPILER_RT_HAS_FLOCK` is defined here: [for linux](https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/profile/CMakeLists.txt#L41-L50)

https://github.com/llvm/llvm-project/pull/111332