[llvm] [DAG][X86] Bitfield insertion can combine into SHL + SHRD (PR #220182)

[Pratyay Pande via llvm-commits]

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@@ -8844,6 +8844,44 @@ static SDValue visitORCommutative(SelectionDAG &DAG, SDValue N0, SDValue N1,
   return SDValue();
 }
 
+// Fold an OR with a masked destination and a left-shifted
+// source into a shift + double-precision shift (SHRD):
+static SDValue combineOrOnSHLToFSHR(SDNode *N, SDLoc &DL, SelectionDAG &DAG) {
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pratyaypande wrote:

Done

https://github.com/llvm/llvm-project/pull/220182