[clang] [CIR] Implement cir.cmp3way Operation (PR #186294)

[Yeongu Choe via cfe-commits]

YeonguChoe wrote:

@erichkeane

No problem. I should have dig into github more before working on it.

```
__builtin_fpclassify
__builtin_signbit
__builtin_flt_rounds
__builtin_set_flt_rounds
_setjmp
```

I will work on those tasks.

I think it is better to ask for task before working on it from now on.

Thanks.

https://github.com/llvm/llvm-project/pull/186294