[llvm] [VPlan] Add transformation to narrow interleave groups. (PR #106441)

[via llvm-commits]

================
@@ -7487,6 +7487,9 @@ LoopVectorizationPlanner::executePlan(
 
   VPlanTransforms::optimizeForVFAndUF(BestVPlan, BestVF, BestUF, PSE);
 
+  if (VPlanTransforms::narrowInterleaveGroups(BestVPlan, BestVF)) {
+    LLVM_DEBUG(dbgs() << "Narrowed interleave\n");
+  }
----------------
ayalz wrote:

```suggestion
  if (VPlanTransforms::narrowInterleaveGroups(BestVPlan, BestVF))
    LLVM_DEBUG(dbgs() << "Narrowed interleave\n");
```
better if the transform itself dumps what it does, possibly along with each interleave narrowed?


https://github.com/llvm/llvm-project/pull/106441