[llvm] [LV] Convert scatter w/uniform addr and mask being header mask to scalar store. (PR #172799)

[Ramkumar Ramachandra via llvm-commits]

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@@ -1845,12 +1845,107 @@ static void reassociateHeaderMask(VPlan &Plan) {
   }
 }
 
+void VPlanTransforms::narrowScatters(VPlan &Plan, VPCostContext &Ctx,
+                                     VFRange &Range,
+                                     const bool &FoldTailWithEVL) {
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artagnon wrote:

```suggestion
                                     bool FoldTailWithEVL) {
```

https://github.com/llvm/llvm-project/pull/172799