[llvm] [VPlan] Implement VPlan-based unit-strideness speculation (PR #182595)

[Luke Lau via llvm-commits]

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@@ -5534,6 +5543,169 @@ void VPlanTransforms::makeMemOpWideningDecisions(VPlan &Plan, VFRange &Range,
                            });
 }
 
+void VPlanTransforms::multiversionForUnitStridedMemOps(
+    VPlan &Plan, VPCostContext &CostCtx, VFRange &Range,
+    SmallVectorImpl<VPInstruction *> &MemOps) {
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lukel97 wrote:

MemOps is read only now so I think this can become an ArrayRef
```suggestion
    ArrayRef<VPInstruction *> MemOps) {
```

https://github.com/llvm/llvm-project/pull/182595