[llvm] [LoopInterchange] Swap preheader contents before rebuilding LCSSA (PR #218468)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/LoopInterchange.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
index 7e8547f95..031b03619 100644
--- a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -2640,9 +2640,9 @@ void LoopInterchangeTransform::adjustLoopBranches() {
   InnerLoopHeader->replacePhiUsesWith(OuterLoopLatch, InnerLoopLatch);
 
   // Swap the preheader contents so each definition sits in the preheader of the
-  // loop it now belongs to. This runs before the LCSSA rebuild below so that any
-  // definition referenced across the interchanged levels dominates its uses when
-  // formLCSSAForInstructions runs.
+  // loop it now belongs to. This runs before the LCSSA rebuild below so that
+  // any definition referenced across the interchanged levels dominates its uses
+  // when formLCSSAForInstructions runs.
   swapBBContents(OuterLoop->getLoopPreheader(), InnerLoop->getLoopPreheader());
 
   // Values defined in the outer loop header could be used in the inner loop

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https://github.com/llvm/llvm-project/pull/218468