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

[Thorsten Schütt via llvm-commits]

================
@@ -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(); }
+
----------------
tschuett wrote:

I replaced the APInt by an uint64_t. The step is unsigned.

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