[gomp4] Fix combined directives.

[James Norris]

Hi!

This patch fixes an issue in handling combined directives. The
code now accepts clauses for both the loop directive and the
other directive, i.e., parallel or kernels.

OK for gomp4 branch?

Thanks!

Jim

ChangeLog

      2014-10-27  James Norris<jnorris@codesourcery.com>

          * c/c-parser.c (c_parser_oacc_loop, OACC_LOOP_CLAUSE_MASK): 
Relocate.
          (c_parser_oacc_kernels, c_parser_oacc_parallel): Fix combined
          directives.
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