Revert "[LoopUtils] Updated deleteDeadLoop() to handle loop nest."

This reverts commit cd09fee3d63296dd2df0bbb1fae363ca9f311d44.
This reverts commit c066ff11d84a7797503ad5a44c4129136926dc85.

1 files changed, 1 insertions, 12 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index 2340e8c72e1..68ef0fe4071 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -673,18 +673,7 @@ void llvm::deleteDeadLoop(Loop *L, DominatorTree *DT = nullptr,
       LI->removeBlock(BB);
 
     // The last step is to update LoopInfo now that we've eliminated this loop.
-    // Note: LoopInfo::erase remove the given loop and relink its subloops with
-    // its parent. While removeLoop/removeChildLoop remove the given loop but
-    // not relink its subloops, which is what we want.
-    if (Loop *ParentLoop = L->getParentLoop()) {
-      Loop::iterator I = find(ParentLoop->begin(), ParentLoop->end(), L);
-      assert(I != ParentLoop->end() && "Couldn't find loop");
-      ParentLoop->removeChildLoop(I);
-    } else {
-      Loop::iterator I = find(LI->begin(), LI->end(), L);
-      assert(I != LI->end() && "Couldn't find loop");
-      LI->removeLoop(I);
-    }
+    LI->erase(L);
   }
 }