[compiler-rt] [llvm] [WebAssembly] Explicitly set `getCmpLibcallReturnType` to i32 (PR #192425)

[Sam Clegg via llvm-commits]

https://github.com/sbc100 commented:

Any idea why this hasn't shown up already, for example, in emscripten?   

https://github.com/llvm/llvm-project/pull/192425