[llvm] [NVPTX] Make i16x2 a native type and add supported vec instructions (PR #65432)

[Artem Belevich via llvm-commits]

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@@ -2122,7 +2192,8 @@ SDValue NVPTXTargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
   // Extract individual elements and select one of them.
   SDValue Vector = Op->getOperand(0);
   EVT VectorVT = Vector.getValueType();
-  assert(VectorVT == MVT::v2f16 && "Unexpected vector type.");
+  assert((VectorVT == MVT::v2f16 || VectorVT == MVT::v2i16) &&
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Artem-B wrote:

We may be missing a v2bf16 here.

https://github.com/llvm/llvm-project/pull/65432