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

[Trevor Gross via llvm-commits]

tgross35 wrote:

> How about just porting emscripten patch here (i.e. just modifying line 15 instead of adding a whole new block?)

Mostly because "// AArch64 GCC overrides libgcc_cmp_return to use int instead of long." doesn't apply here

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