Initial support for the OpenACC kernels construct in the C front end.

Initial support for the OpenACC kernels construct in the C front end.

	gcc/c-family/
	* c-pragma.c (oacc_pragmas): Add "kernels".
	* c-pragma.h (enum pragma_kind): Add PRAGMA_OACC_KERNELS.
	gcc/c/
	* c-parser.c (OACC_KERNELS_CLAUSE_MASK): New macro definition.
	(c_parser_oacc_kernels): New function.
	(c_parser_omp_construct): Handle PRAGMA_OACC_KERNELS.
	* c-tree.h (c_finish_oacc_kernels): New prototype.
	* c-typeck.c (c_finish_oacc_kernels): New function.
	gcc/testsuite/
	* c-c++-common/goacc-gomp/nesting-fail-1.c: Extend for OpenACC
	kernels construct.
	* c-c++-common/goacc/clauses-fail.c: Likewise.
	* c-c++-common/goacc/data-clause-duplicate-1.c: Likewise.
	* c-c++-common/goacc/deviceptr-1.c: Likewise.
	* c-c++-common/goacc/nesting-fail-1.c: Likewise.
	* c-c++-common/goacc/kernels-1.c: New file.
	* gcc.dg/goacc/parallel-sb-1.c: Rename to...
	* gcc.dg/goacc/sb-1.c: ... this new file, and extend for OpenACC
	kernels and data constructs.
	* gcc.dg/goacc/parallel-sb-2.c: Rename to...
	* gcc.dg/goacc/sb-2.c: ... this new file, and extend for OpenACC
	kernels and data constructs.
	libgomp/
	* testsuite/libgomp.oacc-c/goacc_kernels.c: New file.
	* testsuite/libgomp.oacc-c/kernels-1.c: Likewise.
	* testsuite/libgomp.oacc-c/parallel-1.c: Add one missing test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gomp-4_0-branch@208216 138bc75d-0d04-0410-961f-82ee72b054a4