[llvm] [X86] lowerFPToIntToFP - handle UI2FP on AVX512VL targets and i64 types on AVX512DQ targets (PR #162656)

[Kavin Gnanapandithan via llvm-commits]

KavinTheG wrote:

It seems like `X86TargetLowering::LowerSINT_TO_FP` has an early breakout statement calling `lowerFPToIntToFP`, but `LowerUINT_TO_FP` does not. 
```
SDValue X86TargetLowering::LowerSINT_TO_FP(SDValue Op,
                                           SelectionDAG &DAG) const {
 ...
  if (SDValue R = lowerFPToIntToFP(Op, dl, DAG, Subtarget))
    return R;
...
}
```
Will fix this in the next commit. 

https://github.com/llvm/llvm-project/pull/162656