[llvm] [NVPTX] Generalize and extend upsizing when lowering 8/16-bit-element vector loads/stores (PR #119622)

[Drew Kersnar via llvm-commits]

================
@@ -3278,7 +3268,10 @@ NVPTXTargetLowering::LowerSTOREVector(SDValue Op, SelectionDAG &DAG) const {
   Ops.push_back(N->getOperand(0));
 
   // Then the split values
-  if (UpsizeElementTypes) {
+  if (ValVT.getVectorNumElements() > NumElts) {
+    // If the number of elements has changed, getVectorLoweringShape has upsized
----------------
dakersnar wrote:

Done, added asserts

https://github.com/llvm/llvm-project/pull/119622