[llvm] [RISCV] Allow non-loop invariant steps in RISCVGatherScatterLowering (PR #122244)

[Philip Reames via llvm-commits]

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@@ -311,18 +307,31 @@ bool RISCVGatherScatterLowering::matchStridedRecurrence(Value *Index, Loop *L,
   }
   case Instruction::Mul: {
     Start = Builder.CreateMul(Start, SplatOp, "start");
-    Step = Builder.CreateMul(Step, SplatOp, "step");
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preames wrote:

This block of code now entirely duplicates the end of matchStridedStart, maybe we can extract out a helper and use it in both places?  This an idea, not a requirement.  

https://github.com/llvm/llvm-project/pull/122244