[llvm] [LoopFusion] Return early when no two loops are at the same depth. (PR #226590)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/LoopFuse.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/LoopFuse.cpp b/llvm/lib/Transforms/Scalar/LoopFuse.cpp
index 461df18c7..f477b68e0 100644
--- a/llvm/lib/Transforms/Scalar/LoopFuse.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopFuse.cpp
@@ -1918,8 +1918,6 @@ bool hasSiblingLoops(const LoopInfo &LI) {
 
 } // namespace
 
-
-
 PreservedAnalyses LoopFusePass::run(Function &F, FunctionAnalysisManager &AM) {
   auto &LI = AM.getResult<LoopAnalysis>(F);
 

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https://github.com/llvm/llvm-project/pull/226590