parser.c (cp_parser_template_declaration_after_parameters): Use DECL_SOURCE_LOCATION in literal operator template errors.

/cp
2019-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	* parser.c (cp_parser_template_declaration_after_parameters): Use
	DECL_SOURCE_LOCATION in literal operator template errors.

/testsuite
2019-05-21  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/cpp0x/udlit-tmpl-arg-neg2.C: Check locations too.
	* g++.dg/cpp0x/udlit-tmpl-parms-neg.C: Likewise.

From-SVN: r271492