[llvm] [VPlan] Run removeDeadRecipes early. (PR #190191)

[Luke Lau via llvm-commits]

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@@ -8182,6 +8183,10 @@ VPlanPtr LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(
                    Range);
   }
 
+  // Ensure scalar VF plans only contain VF=1, as required by hasScalarVFOnly.
+  if (Range.Start.isScalar())
+    Range.End = Range.Start * 2;
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lukel97 wrote:

Is this meant to be in this PR? There's a surprising amount of test diffs

https://github.com/llvm/llvm-project/pull/190191