[llvm] [VPlan] Connect (MemRuntime|SCEV)Check blocks as VPlan transform (NFC). (PR #143879)

[via llvm-commits]

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@@ -487,10 +487,16 @@ void VPBasicBlock::connectToPredecessors(VPTransformState &State) {
     } else {
       // Set each forward successor here when it is created, excluding
       // backedges. A backward successor is set when the branch is created.
+      // Branches to VPIRBasicBlocks must have the same successors in VPlan as
+      // in the original IR, except if the predecessors is the entry block. This
+      // enables including SCEV and memory runtime check blocks in VPlan.
+      // TODO: Remove exception by modeling branch in the entry block using
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ayalz wrote:

```suggestion
      // TODO: Remove exception by modeling the terminator of entry block using
```

https://github.com/llvm/llvm-project/pull/143879