[llvm] [Utils][UnifyLoopExits] Avoid costly updates if nothing changed (PR #129179)

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``````````bash
git-clang-format --diff 6e7f04266c5f729cf4bc5546e2bf29aad3e695f1 57b3455d89d340ca7a3da02a3efb478b4824f2d7 --extensions cpp,h -- llvm/include/llvm/Transforms/Utils/ControlFlowUtils.h llvm/lib/Transforms/Utils/ControlFlowUtils.cpp llvm/lib/Transforms/Utils/UnifyLoopExits.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Utils/UnifyLoopExits.cpp b/llvm/lib/Transforms/Utils/UnifyLoopExits.cpp
index ede0f70c6e..0c2c72a9fd 100644
--- a/llvm/lib/Transforms/Utils/UnifyLoopExits.cpp
+++ b/llvm/lib/Transforms/Utils/UnifyLoopExits.cpp
@@ -173,8 +173,8 @@ static bool unifyLoopExits(DominatorTree &DT, LoopInfo &LI, Loop *L) {
   bool ChangedCFG;
   std::tie(LoopExitBlock, ChangedCFG) = CHub.finalize(
       &DTU, GuardBlocks, "loop.exit", MaxBooleansInControlFlowHub.getValue());
-//  if (!ChangedCFG)
-//    return false;
+  //  if (!ChangedCFG)
+  //    return false;
 
   L->getHeader()->getParent()->dump();
   restoreSSA(DT, L, ExitingBlocks, LoopExitBlock);

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https://github.com/llvm/llvm-project/pull/129179