[llvm] [DomTree] Remove redundant getNodeForBlock. NFC (PR #215045)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/Support/GenericDomTreeConstruction.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/include/llvm/Support/GenericDomTreeConstruction.h b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
index f644ddc1b..11ed3aca3 100644
--- a/llvm/include/llvm/Support/GenericDomTreeConstruction.h
+++ b/llvm/include/llvm/Support/GenericDomTreeConstruction.h
@@ -604,7 +604,8 @@ template <typename DomTreeT> struct SemiNCAInfo {
       if (DT.getNode(W))
         continue; // Already calculated the node before
 
-      // W's dominator has a smaller DFS number, so its tree node already exists.
+      // W's dominator has a smaller DFS number, so its tree node already
+      // exists.
       NodePtr ImmDom = getIDom(W);
       TreeNodePtr IDomNode = DT.getNode(ImmDom);
       assert(IDomNode);

``````````

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https://github.com/llvm/llvm-project/pull/215045