[llvm] [llvm] Add NCD search on Array of basic blocks (PR #119355)

[via llvm-commits]

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@@ -189,3 +189,19 @@ void MachineDominatorTree::applySplitCriticalEdges() const {
   NewBBs.clear();
   CriticalEdgesToSplit.clear();
 }
+
+MachineBasicBlock *MachineDominatorTree::findNearestCommonDominator(
+    ArrayRef<MachineBasicBlock *> Blocks) const {
+  assert(!Blocks.empty());
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paperchalice wrote:

`assert` with error message if possible: https://llvm.org/docs/CodingStandards.html#id45

https://github.com/llvm/llvm-project/pull/119355