Index: include/llvm/Support/Debug.h
===================================================================
--- include/llvm/Support/Debug.h
+++ include/llvm/Support/Debug.h
@@ -94,6 +94,10 @@
 ///
 extern bool VerifyLoopInfo;
 
+/// Enables verification of MemorySSA.
+///
+extern bool VerifyMemorySSA;
+
 ///\}
 
 /// EnableDebugBuffering - This defaults to false.  If true, the debug
Index: lib/Analysis/MemorySSA.cpp
===================================================================
--- lib/Analysis/MemorySSA.cpp
+++ lib/Analysis/MemorySSA.cpp
@@ -77,9 +77,10 @@
     cl::desc("The maximum number of stores/phis MemorySSA"
              "will consider trying to walk past (default = 100)"));
 
-static cl::opt<bool>
-    VerifyMemorySSA("verify-memoryssa", cl::init(false), cl::Hidden,
-                    cl::desc("Verify MemorySSA in legacy printer pass."));
+bool llvm::VerifyMemorySSA = false;
+static cl::opt<bool, true>
+    VerifyMemorySSAX("verify-memoryssa", cl::location(VerifyMemorySSA),
+                     cl::Hidden, cl::desc("Enable verify of MemorySSA."));
 
 namespace llvm {