[llvm] [LoopInterchange] Also look at lcssa phis in outer loop latch block (PR #160889)

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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
index e42d82d15..ad63214f0 100644
--- a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -43,8 +43,8 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Scalar/LoopPassManager.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "llvm/Transforms/Utils/LoopUtils.h"
 #include "llvm/Transforms/Utils/Local.h"
+#include "llvm/Transforms/Utils/LoopUtils.h"
 #include <cassert>
 #include <utility>
 #include <vector>
@@ -1867,8 +1867,8 @@ static void moveLCSSAPhis(BasicBlock *InnerExit, BasicBlock *InnerHeader,
   SmallVector<PHINode *, 8> LcssaOuterLatch(
       llvm::make_pointer_range(OuterLatch->phis()));
   for (PHINode *P : LcssaOuterLatch)
-     if (isInstructionTriviallyDead(P))
-       P->eraseFromParent();
+    if (isInstructionTriviallyDead(P))
+      P->eraseFromParent();
 
   // Deal with LCSSA PHI nodes in the loop nest exit block. For PHIs that have
   // incoming values defined in the outer loop, we have to add a new PHI

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https://github.com/llvm/llvm-project/pull/160889