[llvm] [GlobalISel] Add G_STEP_VECTOR instruction (PR #115598)

[Amara Emerson via llvm-commits]

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@@ -906,6 +906,16 @@ class GVScale : public GenericMachineInstr {
   };
 };
 
+/// Represents a step vector.
+class GStepVector : public GenericMachineInstr {
+public:
+  APInt getStep() const { return getOperand(1).getCImm()->getValue(); }
+
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aemerson wrote:

Maybe also add a variant to return a uint64_t for convenience?

https://github.com/llvm/llvm-project/pull/115598