[llvm] Reland "[BasicBlockUtils] Fix dominator tree update for entry block in splitBlockBefore() (#178895) (PR #179392)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/CodeGen/CodeGenPrepare.cpp llvm/lib/Transforms/Utils/BasicBlockUtils.cpp llvm/unittests/Transforms/Utils/BasicBlockUtilsTest.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 43714b7ae..4eb771a55 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -6868,7 +6868,8 @@ bool CodeGenPrepare::splitLargeGEPOffsets() {
           NewBaseInsertPt = NewBaseInsertBB->getFirstInsertionPt();
         else if (InvokeInst *Invoke = dyn_cast<InvokeInst>(BaseI)) {
           NewBaseInsertBB =
-              SplitEdge(NewBaseInsertBB, Invoke->getNormalDest(), &getDT(*NewBaseInsertBB->getParent()), LI);
+              SplitEdge(NewBaseInsertBB, Invoke->getNormalDest(),
+                        &getDT(*NewBaseInsertBB->getParent()), LI);
           NewBaseInsertPt = NewBaseInsertBB->getFirstInsertionPt();
         } else
           NewBaseInsertPt = std::next(BaseI->getIterator());

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https://github.com/llvm/llvm-project/pull/179392