gcc/
	* config/nvptx/nvptx.c (PTX_GANG_DEFAULT): New.
	(nvptx_goacc_validate_dims): Extend to handle global defaults.
	* target.def (OACC_VALIDATE_DIMS): Extend documentation.
	* doc/tm.texti: Rebuilt.
	* doc/invoke.texi (fopenacc-dim): Document.
	* lto-wrapper.c (merge_and_complain): Add OPT_fopenacc_dim_ case.
	(append_compiler_options): Likewise.
	* omp-low.c (oacc_default_dims, oacc_min_dims): New.
	(oacc_parse_default_dims): New.
	(oacc_validate_dims): Add USED arg.  Select non-unity default when
	possible.
	(oacc_loop_fixed_partitions): Return mask of used partitions.
	(oacc_loop_auto_partitions): Emit dump info.
	(oacc_loop_partition): Return mask of used partitions.
	(execute_oacc_device_lower): Parse default dimension arg.  Adjust
	loop partitioning and validation calls.

	gcc/c-family/
	* c.opt (fopenacc-dim=): New option.

	gcc/fortran/
	* lang.opt (fopenacc-dim=): New option.

	libgomp/
	* testsuite/libgomp.oacc-c-c++-common/loop-dim-default.c: New.
	* testsuite/libgomp.oacc-fortran/routine-7.f90: Serialize loop.

From-SVN: r233041