c-parser.c (check_no_duplicate_clause): Simplify using omp_find_clause.

c-parser.c (check_no_duplicate_clause): Simplify using omp_find_clause.

c/
	* c-parser.c (check_no_duplicate_clause): Simplify using
	omp_find_clause.
	(c_parser_omp_clause_if): Fix up printing of target {enter,exit} data
	directive name modifiers.
	(c_parser_omp_clause_proc_bind): Check for duplicate proc_bind clause.
cp/
	* parser.c (check_no_duplicate_clause): Simplify using
	omp_find_clause.
	(cp_parser_omp_clause_if): Fix up printing of target {enter,exit} data
	directive name modifiers.
testsuite/
	* c-c++-common/gomp/if-4.c: New test.
	* c-c++-common/gomp/clause-dups-1.c: New test.

From-SVN: r274227