[llvm] [VPlan] Move addExplicitVectorLength to tryToBuildVPlanWithVPRecipes (PR #166164)

[Florian Hahn via llvm-commits]

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@@ -4118,6 +4118,11 @@ class LLVM_ABI_FOR_TEST VPRegionBlock : public VPBlockBase {
     return const_cast<VPRegionBlock *>(this)->getCanonicalIV();
   }
 
+  VPEVLBasedIVPHIRecipe *getEVLBasedIV() {
+    return dyn_cast<VPEVLBasedIVPHIRecipe>(
+        std::next(getCanonicalIV()->getIterator()));
+  }
+
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fhahn wrote:

Not sure this should be exposed in VPRegionBlock for a single user.

https://github.com/llvm/llvm-project/pull/166164