Merge 99762 from mainline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_27@99908 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Memory.h

@@ -27,7 +27,7 @@ namespace sys {
   /// @brief Memory block abstraction.
   class MemoryBlock {
   public:
-    MemoryBlock() { }
+    MemoryBlock() : Address(0), Size(0) { }
     MemoryBlock(void *addr, size_t size) : Address(addr), Size(size) { }
     void *base() const { return Address; }
     size_t size() const { return Size; }