Index: include/llvm/Analysis/LoopAnalysisManager.h
===================================================================
--- include/llvm/Analysis/LoopAnalysisManager.h
+++ include/llvm/Analysis/LoopAnalysisManager.h
@@ -61,9 +61,6 @@
   MemorySSA *MSSA;
 };
 
-/// Enables memory ssa as a dependency for loop passes.
-extern cl::opt<bool> EnableMSSALoopDependency;
-
 /// Extern template declaration for the analysis set for this IR unit.
 extern template class AllAnalysesOn<Loop>;
 
Index: include/llvm/Analysis/MemorySSA.h
===================================================================
--- include/llvm/Analysis/MemorySSA.h
+++ include/llvm/Analysis/MemorySSA.h
@@ -104,6 +104,9 @@
 
 namespace llvm {
 
+/// Enables memory ssa as a dependency for loop passes.
+extern cl::opt<bool> EnableMSSALoopDependency;
+
 class Function;
 class Instruction;
 class MemoryAccess;
Index: lib/Transforms/Utils/LCSSA.cpp
===================================================================
--- lib/Transforms/Utils/LCSSA.cpp
+++ lib/Transforms/Utils/LCSSA.cpp
@@ -33,9 +33,9 @@
 #include "llvm/Analysis/BasicAliasAnalysis.h"
 #include "llvm/Analysis/GlobalsModRef.h"
 #include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/MemorySSA.h"
 #include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
-#include "llvm/Transforms/Utils/Local.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
@@ -44,6 +44,7 @@
 #include "llvm/IR/PredIteratorCache.h"
 #include "llvm/Pass.h"
 #include "llvm/Transforms/Utils.h"
+#include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
 #include "llvm/Transforms/Utils/SSAUpdater.h"
 using namespace llvm;
@@ -442,6 +443,7 @@
     AU.addPreserved<GlobalsAAWrapperPass>();
     AU.addPreserved<ScalarEvolutionWrapperPass>();
     AU.addPreserved<SCEVAAWrapperPass>();
+    AU.addPreserved<MemorySSAWrapperPass>();
 
     // This is needed to perform LCSSA verification inside LPPassManager
     AU.addRequired<LCSSAVerificationPass>();
@@ -485,5 +487,9 @@
   PA.preserve<GlobalsAA>();
   PA.preserve<SCEVAA>();
   PA.preserve<ScalarEvolutionAnalysis>();
+  // In the new pass manager, LCSSA must mark the AAManager as preserved too, in
+  // order to correctly preserve MemorySSA.
+  PA.preserve<MemorySSAAnalysis>();
+  PA.preserve<AAManager>();
   return PA;
 }