decl.c (bad_specifiers): Add const location_t* parameter and use locations in error messages about...

/cp
2018-06-23  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (bad_specifiers): Add const location_t* parameter and
	use locations in error messages about 'inline' and 'virtual'.
	(mark_inline_variable): Add location_t parameter and use it in
	error_at and pedwarn messages.
	(grokdeclarator): Use declspecs->locations[ds_constexpr],
	declspecs->locations[ds_concept], declspecs->locations[ds_virtual],
	declspecs->locations[ds_inline] in many error messages; adjust
	bad_specifiers and mark_inline_variable calls.
	(grokvardecl): Use declspecs->locations[ds_concept] in error message.

/testsuite
2018-06-23  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/concepts/locations1.C: New.
	* g++.dg/cpp0x/locations1.C: Likewise.
	* g++.dg/cpp1z/inline-var2.C: Test locations too.
	* g++.dg/cpp1z/inline-var3.C: Likewise.

From-SVN: r261982