Implement LWG#1203 (https://cplusplus.github.io/LWG/issue1203) for raw_ostream like libc++ does for std::basic_ostream<...>.
Add a operator<< overload that takes an rvalue reference of a typed derived from raw_ostream, streams the value to it and returns the stream of the same type as the argument.
This allows free operator<< to work with rvalue reference raw_ostreams:
raw_ostream& operator<<(raw_ostream&, const SomeType& Value);
raw_os_ostream(std::cout) << SomeType();
It also allows using the derived type like:
auto Foo = (raw_string_ostream(buffer) << "foo").str();