decl.c (has_designator_problem): Use cp_expr_loc_or_input_loc in error_at.

decl.c (has_designator_problem): Use cp_expr_loc_or_input_loc in error_at.

/cp
2019-09-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (has_designator_problem): Use cp_expr_loc_or_input_loc
	in error_at.
	(build_enumerator): Likewise.
	(cp_finish_decl): Use DECL_SOURCE_LOCATION.
	(grokdeclarator): Use id_loc in two error_at; change errror
	message about constinit together constexpr to use two ranges.

/testsuite
2019-09-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/cpp0x/enum29.C: Test location(s) too.
	* g++.dg/cpp0x/lambda/lambda-ice10.C: Likewise.
	* g++.dg/cpp2a/constinit3.C: Likewise.
	* g++.dg/ext/desig4.C: Likewise.
	* g++.dg/ext/label10.C: Likewise.
	* g++.old-deja/g++.other/dtor3.C: Likewise.

From-SVN: r275585