decl.c (grokdeclarator): Use typespec_loc in error messages about 'auto' and trailing...

decl.c (grokdeclarator): Use typespec_loc in error messages about 'auto' and trailing return type.

/cp
2019-01-17  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (grokdeclarator): Use typespec_loc in error messages
	about 'auto' and trailing return type.

/testsuite
2019-01-17  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/cpp0x/auto52.C: Test locations too.
	* g++.dg/cpp0x/trailing2.C: Likewise.
	* g++.dg/cpp1y/auto-fn18.C: Likewise.
	* g++.dg/cpp1y/auto-fn25.C: Likewise.
	* g++.dg/cpp1y/auto-fn52.C: Likewise.
	* g++.dg/cpp1y/auto-fn53.C: Likewise.
	* g++.dg/cpp1y/auto-fn54.C: Likewise.

From-SVN: r268043