regex_automaton.h (__detail::_State): Split non-dependent parts into new _State_base.

regex_automaton.h (__detail::_State): Split non-dependent parts into new _State_base.

	* include/bits/regex_automaton.h (__detail::_State): Split
	non-dependent parts into new _State_base.
	(__detail::_NFA): Likewise for _NFA_base. Use std::move() to avoid
	copies when inserting _MatcherT and _StateT objects.
	* include/bits/regex_automaton.tcc: Move member definitions to base
	class. Qualify dependent names.
	* include/bits/regex_compiler.h (__detail::_Compiler::_M_get_nfa): Make
	non-const and use std::move to avoid copying.
	* include/bits/regex_compiler.tcc: Likewise.
	* include/bits/regex_executor.h (__detail::_Executor::_M_is_word): Use
	array, so past-the-end iterator is valid.

From-SVN: r204571