[llvm] [VPlan] Remove ResumePhi opcode, use regular PHI instead (NFC). (PR #140405)

[Luke Lau via llvm-commits]

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@@ -7535,10 +7534,7 @@ static void fixReductionScalarResumeWhenVectorizingEpilog(
   // created a bc.merge.rdx Phi after the main vector body. Ensure that we carry
   // over the incoming values correctly.
   using namespace VPlanPatternMatch;
-  auto IsResumePhi = [](VPUser *U) {
-    auto *VPI = dyn_cast<VPInstruction>(U);
-    return VPI && VPI->getOpcode() == VPInstruction::ResumePhi;
-  };
+  auto IsResumePhi = [](VPUser *U) { return isa<VPPhi>(U); };
   assert(count_if(EpiRedResult->users(), IsResumePhi) == 1 &&
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lukel97 wrote:

Can this become
```suggestion
  assert(count_if(EpiRedResult->users(), IsaPred<VPPhi>) == 1 &&
```

https://github.com/llvm/llvm-project/pull/140405