[llvm] [GlobalIsel] Combine extract vector element (PR #90339)

[Matt Arsenault via llvm-commits]

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@@ -294,6 +294,18 @@ class GBuildVectorTrunc : public GMergeLikeInstr {
   }
 };
 
+/// Respresents a G_SHUFFLE_VECTOR.
+class GShuffleVector : public GenericMachineInstr {
+public:
+  Register getSrc1Reg() const { return getOperand(1).getReg(); }
+  Register getSrc2Reg() const { return getOperand(2).getReg(); }
+  llvm::ArrayRef<int> getMask() const { return getOperand(3).getShuffleMask(); }
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arsenm wrote:

Don't need llvm:: 

https://github.com/llvm/llvm-project/pull/90339