* config/arc/arc.c (arc_cpu_string): Make static. Default to "base"

	* config/arc/arc.c (arc_cpu_string): Make static.  Default to "base"
	(arc_text_string, arc_data_string, arc_rodata_string): Make static.
	(TARGET_HANDLE_OPTION): Override default.
	(arc_handle_option): New function.
	(arc_init): Remove code to set arch_cpu_string.
	* config/arc/arc.h (target_flags, TARGET_MASK_MANGLE_CPU)
	(TARGET_MANGLE_CPU, TARGET_MASK_MANGLE_CPU_LIBGCC)
	(TARGET_MANGLE_CPU_LIBGCC, TARGET_MASK_ALIGN_LOOPS, TARGET_ALIGN_LOOPS)
	(TARGET_MASK_BIG_ENDIAN, TARGET_BIG_ENDIAN, TARGET_MASK_NO_COND_EXEC)
	(TARGET_NO_COND_EXEC, TARGET_SWITCHES, TARGET_DEFAULT)
	(SUBTARGET_SWITCHES, arc_cpu_string, arc_text_string, arc_data_string)
	(arc_rodata_string, TARGET_OPTIONS): Delete.
	* config/arc/arc.opt: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96607 138bc75d-0d04-0410-961f-82ee72b054a4