default.exp: New file.

	* testsuite/config/default.exp: New file.
	* testsuite/lib/libgomp.exp: New file.
	* testsuite/lib/libgomp.dg (load_gcc_lib, libgomp_init,
	libgomp_target_compile, libgomp_option_help, libgomp_option_proc,
	load_lib *, load_gcc_lib *): Move to libgomp.exp.
	(libgomp_load): Remove.
	* testsuite/lib/libgomp.exp (libgomp_init): Compute
	always_ld_library_path, not ld_library_path.  Set additional_flags
	to -march=i486 for ilp32 x86_64-*-* and i386-*-* targets.
	(target_compile): Do not call libgomp_init.  Append lang_library_path
	and lang_link_flags to options.
	* testsuite/libgomp.c/c.exp: Set DEFAULT_FLAGS to -O2.  Set
	ld_library_path from always_ld_library_path.  Set LD_LIBRARY_PATH
	here.
	* testsuite/libgomp.c++/c++.exp: Set ld_library_path from
	always_ld_library_path.  Set LD_LIBRARY_PATH here.
	* testsuite/libgomp.fortran/fortran.exp: Ditto.
	* testsuite/libgomp.c/atomic-1.c: Set dg-options to
	"-O2 -march=pentium" for ilp32 x86 targets. Simplify check for
	CX8 flag.
	* testsuite/libgomp.c/atomic-2.c: Set dg-options to "-O2 -mcx16" for
	lp64 x86 targets. Do not check for SSE3 bit. Do not define bit_SSE3.
	* testsuite/libgomp.c/pr29947-1.c: Remove default dg-options.
	* testsuite/libgomp.c/pr29947-1.c: Ditto.
	* testsuite/libgomp.c/atomic-10.c: Ditto.

From-SVN: r123125