OpenACC wait list diagnostic change

OpenACC wait list diagnostic change

2018-12-04  James Norris  <jnorris@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>
	    Julian Brown  <julian@codesourcery.com>

	gcc/c/
	* c-parser.c (c_parser_oacc_wait_list): Remove dead diagnostic
	code.

	gcc/cp/
	* parser.c (cp_parser_oacc_wait_list): Fix error message and avoid
	duplicate diagnostic.

	gcc/testsuite/
	* c-c++-common/goacc/asyncwait-1: Update expected errors and add a
	test for "wait (".

Reviewed-by: Thomas Schwinge  <thomas@codesourcery.com>
Reviewed-by: Joseph Myers  <joseph@codesourcery.com>
From-SVN: r266774