[llvm] [NFC][NVPTX] Cleanup getPreferredVectorAction() (PR #114115)

[Artem Belevich via llvm-commits]

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@@ -1337,8 +1337,6 @@ NVPTXTargetLowering::getPreferredVectorAction(MVT VT) const {
   if (!VT.isScalableVector() && VT.getVectorNumElements() != 1 &&
       VT.getScalarType() == MVT::i1)
     return TypeSplitVector;
-  if (Isv2x16VT(VT))
-    return TypeLegal;
   return TargetLoweringBase::getPreferredVectorAction(VT);
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Artem-B wrote:

AFAICT, `TargetLoweringBase::getPreferredVectorAction(VT)` will return TypePromoteInteger, which is not what we want here.
https://github.com/llvm/llvm-project/blob/a18af41c20ac9ca22e3c95da3d71475f9f6c31b5/llvm/include/llvm/CodeGen/TargetLowering.h#L518



https://github.com/llvm/llvm-project/pull/114115