formatter.h (_Error_formatter::_M_function): New.

formatter.h (_Error_formatter::_M_function): New.

2018-05-08  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/formatter.h (_Error_formatter::_M_function): New.
	(_Error_formatter(const char*, unsigned int)): Adapt.
	(_Error_formatter::_M_at): Rename in...
	(_Error_formatter::_S_at): ...that and adapt.
	* include/debug/macros.h (_GLIBCXX_DEBUG_VERIFY_AT_F): New.
	(_GLIBCXX_DEBUG_VERIFY_AT, _GLIBCXX_DEBUG_VERIFY): Adapt.
	* src/c++11/debug.cc (_Error_formatter::_M_error): Render _M_function
	when available.

From-SVN: r260052