[llvm] [VPlan] Replace VPRegionBlock with explicit CFG before execute (NFCI). (PR #117506)

[Florian Hahn via llvm-commits]

================
@@ -1124,10 +1121,6 @@ void VPInstructionWithType::print(raw_ostream &O, const Twine &Indent,
 
 void VPPhi::execute(VPTransformState &State) {
   State.setDebugLocFrom(getDebugLoc());
-  assert(getParent() ==
-             getParent()->getPlan()->getVectorLoopRegion()->getEntry() &&
-         "VPInstructions with PHI opcodes must be used for header phis only "
----------------
fhahn wrote:

Yep

https://github.com/llvm/llvm-project/pull/117506