Use isa<VPPhi>

Author: lukel97

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

@@ -79,9 +79,8 @@ bool VPlanVerifier::verifyPhiRecipes(const VPBasicBlock *VPBB) {
     if (isa<VPActiveLaneMaskPHIRecipe>(RecipeI))
       NumActiveLaneMaskPhiRecipes++;
 
-    if (IsHeaderVPBB && !isa<VPHeaderPHIRecipe, VPWidenPHIRecipe>(*RecipeI) &&
-        !(isa<VPInstruction>(*RecipeI) &&
-          cast<VPInstruction>(RecipeI)->getOpcode() == Instruction::PHI)) {
+    if (IsHeaderVPBB &&
+        !isa<VPHeaderPHIRecipe, VPWidenPHIRecipe, VPPhi>(*RecipeI)) {
       errs() << "Found non-header PHI recipe in header VPBB";
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
       errs() << ": ";