Disable the StringMapEntry copy constructor, to make sure we

reject things like: "for (auto Entry : SomeStringMap)".  Previously
this would copy the value but not the tail allocated string data
(the key).

llvm-svn: 182713

include/llvm/ADT/StringMap.h

@@ -116,6 +116,7 @@ public:
 /// and data.
 template<typename ValueTy>
 class StringMapEntry : public StringMapEntryBase {
+  StringMapEntry(StringMapEntry &E) LLVM_DELETED_FUNCTION;
 public:
   ValueTy second;