Revert "LSV: document hang reported in llvm#37865 (llvm#102479)"

This reverts commit 199d6f2, as there is a buildbot failure.

Author: artagnon

llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp

@@ -216,8 +216,6 @@ void reorder(Instruction *I) {
       if (IM->getParent() != I->getParent())
         continue;
 
-      assert(IM != I && "Unexpected cycle while re-ordering instructions");
-
       if (!IM->comesBefore(I)) {
         InstructionsToMove.insert(IM);
         Worklist.push_back(IM);