[llvm] [X86][CodeGen] Support EVEX compression: NDD to nonNDD (PR #77731)

[Phoebe Wang via llvm-commits]

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@@ -220,6 +220,27 @@ static bool performCustomAdjustments(MachineInstr &MI, unsigned NewOpc) {
   return true;
 }
 
+static bool isRedundantNewDataDest(MachineInstr &MI, const X86Subtarget &ST) {
+  // add rbx, rbx, rax / add rbx, rax, rbx -> add rbx, rax
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phoebewang wrote:

It would be better if you use a real node, e.g., ADDrr_ND instead of a add.

https://github.com/llvm/llvm-project/pull/77731