Index: lib/Transforms/Scalar/LICM.cpp
===================================================================
--- lib/Transforms/Scalar/LICM.cpp
+++ lib/Transforms/Scalar/LICM.cpp
@@ -202,21 +202,28 @@
 
   assert(L->isLCSSAForm(*DT) && "Loop is not in LCSSA form.");
 
-  CurAST = new AliasSetTracker(*AA);
+  CurAST = nullptr;
   // Collect Alias info from subloops.
   for (Loop *InnerL : L->getSubLoops()) {
     AliasSetTracker *InnerAST = LoopToAliasSetMap[InnerL];
     assert(InnerAST && "Where is my AST?");
 
-    // What if InnerLoop was modified by other passes ?
-    CurAST->add(*InnerAST);
+    if (CurAST != nullptr) {
+      // What if InnerLoop was modified by other passes ?
+      CurAST->add(*InnerAST);
 
-    // Once we've incorporated the inner loop's AST into ours, we don't need the
-    // subloop's anymore.
-    delete InnerAST;
+      // Once we've incorporated the inner loop's AST into ours, we don't need
+      // the subloop's anymore.
+      delete InnerAST;
+    } else {
+      CurAST = InnerAST;
+    }
     LoopToAliasSetMap.erase(InnerL);
   }
 
+  if (CurAST == nullptr)
+    CurAST = new AliasSetTracker(*AA);
+
   CurLoop = L;
 
   // Get the preheader block to move instructions into...