[MemorySSA] Fix windows build breakage caused by r278028 (take 2)

r278028: [MemorySSA] Ensure address stability of MemorySSA object.
llvm-svn: 278041

include/llvm/Transforms/Utils/MemorySSA.h

@@ -680,7 +680,12 @@ public:
   // unique_ptr<MemorySSA> to avoid build breakage on MSVC.
   struct Result {
     Result(std::unique_ptr<MemorySSA> &&MSSA) : MSSA(std::move(MSSA)) {}
+    Result(Result &&R) : MSSA(std::move(R.MSSA)) {}
     MemorySSA &getMSSA() { return *MSSA.get(); }
+
+    Result(const Result &) = delete;
+    void operator=(const Result &) = delete;
+
     std::unique_ptr<MemorySSA> MSSA;
   };