[llvm] [VPlan] Run narrowInterleaveGroups during general VPlan optimizations. (PR #149706)

[Florian Hahn via llvm-commits]

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@@ -4050,6 +4053,9 @@ class VPlan {
   /// Returns the VF of the vector loop region.
   VPValue &getVF() { return VF; };
 
+  /// Returns the symbolic UF of the vector loop region.
+  VPValue &getSymbolicUF() { return UF; };
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fhahn wrote:

Unfortunately this cann't be made const, as it is used with `replaceAllUsesWith`, which cannot be const.

https://github.com/llvm/llvm-project/pull/149706