[llvm] [Support] Use block numbers for DomTree construction (PR #101706)

[Alexis Engelke via llvm-commits]

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@@ -123,13 +132,29 @@ struct SemiNCAInfo {
     return Res;
   }
 
-  NodePtr getIDom(NodePtr BB) const {
-    auto InfoIt = NodeToInfo.find(BB);
-    if (InfoIt == NodeToInfo.end()) return nullptr;
+  template <class T_ = NodeT>
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aengelke wrote:

Used if constexpr instead, as in #101705.

https://github.com/llvm/llvm-project/pull/101706