[llvm] [GlobalIsel] Transform build_vector(binop(_, C), ...) -> binop(bv, constant bv) (PR #73577)

[Amara Emerson via llvm-commits]

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@@ -558,6 +558,60 @@ class GVecReduce : public GenericMachineInstr {
   }
 };
 
+// Represents an integer binary operation.
+class GIBinOp : public GenericMachineInstr {
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aemerson wrote:

Can we rename this to `GIntBinop` otherwise `GI` could be confused with *GI*Sel.

https://github.com/llvm/llvm-project/pull/73577