[llvm] [LoopVectorizer] Prune VFs based on plan register pressure (PR #132190)

[Sander de Smalen via llvm-commits]

================
@@ -4526,6 +4506,253 @@ static bool willGenerateVectors(VPlan &Plan, ElementCount VF,
   return false;
 }
 
+/// Get the VF scaling factor applied to the recipe's output, if the recipe has
----------------
sdesmalen-arm wrote:

+1 to that :)

https://github.com/llvm/llvm-project/pull/132190