[llvm] [VPlan][NFCI] Small code quality fixes in VPlanHCFGBuilder (PR #134324)

[Florian Hahn via llvm-commits]

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@@ -423,7 +424,7 @@ void PlainCFGBuilder::buildPlainCFG(
     BasicBlock *IRSucc1 = BI->getSuccessor(1);
     VPBasicBlock *Successor0 = getOrCreateVPBB(IRSucc0);
     VPBasicBlock *Successor1 = getOrCreateVPBB(IRSucc1);
-    if (BB == LoopForBB->getLoopLatch()) {
+    if (BB == LoopForBB->getLoopLatch() && Region) {
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fhahn wrote:

If anything, an assert should be added. FYI the code will probably go away in the near future: https://github.com/llvm/llvm-project/pull/129402

https://github.com/llvm/llvm-project/pull/134324