[llvm] [X86][ConstraintFP] Model rounding control registers for inline asm (PR #92846)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

```
Failed Tests (5):
  LLVM :: CodeGen/AMDGPU/fp_to_sint.ll
  LLVM :: CodeGen/AMDGPU/fp_to_uint.ll
  LLVM :: CodeGen/AMDGPU/llvm.exp.ll
  LLVM :: CodeGen/AMDGPU/llvm.exp10.ll
  LLVM :: CodeGen/AMDGPU/shl.ll
```

These 5 tests failed on trunk too, not related to this patch.




https://github.com/llvm/llvm-project/pull/92846