[llvm] [VPlan] Introduce child regions as VPlan transform. (PR #129402)

[via llvm-commits]

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@@ -351,6 +282,8 @@ void PlainCFGBuilder::createVPInstructionsForVPBB(VPBasicBlock *VPBB,
 // Main interface to build the plain CFG.
 void PlainCFGBuilder::buildPlainCFG(
     DenseMap<VPBlockBase *, BasicBlock *> &VPB2IRBB) {
+  VPIRBasicBlock *Entry = cast<VPIRBasicBlock>(Plan.getEntry());
+  BB2VPBB[Entry->getIRBasicBlock()] = Entry;
 
   // 1. Scan the body of the loop in a topological order to visit each basic
   // block after having visited its predecessor basic blocks. Create a VPBB for
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ayalz wrote:

typo below: incomming

https://github.com/llvm/llvm-project/pull/129402