[llvm] [VPlan] Add BranchOnMultiCond, use for early exit plans. (PR #172750)

[via llvm-commits]

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@@ -3714,6 +3714,54 @@ void VPlanTransforms::dissolveLoopRegions(VPlan &Plan) {
     R->dissolveToCFGLoop();
 }
 
+void VPlanTransforms::expandBranchOnTwoConds(VPlan &Plan) {
+  // Expand BranchOnTwoConds instructions into explicit CFG with
+  // single-condition branches
+  SmallVector<VPInstruction *> WorkList;
+  for (VPBasicBlock *VPBB : VPBlockUtils::blocksOnly<VPBasicBlock>(
+           vp_depth_first_shallow(Plan.getEntry()))) {
+    assert((!isa<VPRegionBlock>(VPBB) ||
+            cast<VPRegionBlock>(VPBB)->isReplicator()) &&
+           "only replicating regions must remain");
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ayalz wrote:

```suggestion
           "only replicating regions expected");
```

https://github.com/llvm/llvm-project/pull/172750