[llvm] [NVPTX] Add PRMT constant folding and cleanup usage of PRMT node (PR #148906)

[Alex MacLean via llvm-commits]

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@@ -2060,6 +2063,13 @@ NVPTXTargetLowering::LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) const {
   return DAG.getBuildVector(Node->getValueType(0), dl, Ops);
 }
 
+static SDValue getPRMT(SDValue A, SDValue B, SDValue Selector, SDLoc DL,
+                       SelectionDAG &DAG,
+                       unsigned Mode = NVPTX::PTXPrmtMode::NONE) {
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AlexMaclean wrote:

Added

https://github.com/llvm/llvm-project/pull/148906