libgomp: For OpenMP offloading, only publicize GOMP_OFFLOAD_CAP_OPENMP_400 devices.

libgomp: For OpenMP offloading, only publicize GOMP_OFFLOAD_CAP_OPENMP_400 devices.

	libgomp/
	* target.c (num_devices_openmp): New variable.
	(gomp_get_num_devices): Use it.
	(gomp_target_init): Initialize it, and sort the devices array
	appropriately.

With Intel MIC offloading (emulation), this fixes:

    FAIL: libgomp.c/examples-4/e.57.2.c execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O0  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O1  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O2  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O3 -fomit-frame-pointer  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O3 -fomit-frame-pointer -funroll-loops  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -O3 -g  execution test
    FAIL: libgomp.fortran/examples-4/e.57.2.f90   -Os  execution test

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gomp-4_0-branch@219029 138bc75d-0d04-0410-961f-82ee72b054a4