[llvm] [LoopInterchange] Bail out early if minimum loop nest is not met (PR #115128)

[via llvm-commits]

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@@ -416,11 +424,11 @@ struct LoopInterchange {
 
   bool processLoopList(SmallVectorImpl<Loop *> &LoopList) {
     bool Changed = false;
-    unsigned LoopNestDepth = LoopList.size();
-    if (LoopNestDepth < 2) {
-      LLVM_DEBUG(dbgs() << "Loop doesn't contain minimum nesting level.\n");
+
+    if (!hasMinimumLoopDepth(LoopList))
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CongzheUalberta wrote:

Yes I think it makes sense to convert it to an assert here.

https://github.com/llvm/llvm-project/pull/115128