Improves speed in several common header code paths using String.
Detected by Coverity Scan. Issue
1364732.
String();
String(char const *);
String(String const &);
+ String(String &&) = default;
~String();
typedef size_t size_type; //storage size intentionally unspecified
String &operator =(char const *);
String &operator =(String const &);
+ String &operator =(String &&) = default;
bool operator ==(String const &) const;
bool operator !=(String const &) const;