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

[via llvm-commits]

arsnyder16 wrote:

@sbc100 This seems like its a [start of what i was going to look at](https://github.com/emscripten-core/emscripten/pull/13072#issuecomment-2807400847). 

@kateinoigakukun Any update here? Looks like some of this may have been reverted? 

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