h8300.c (h8300_init_once): Allow -mn switch only if -mh or -ms present.

h8300.c (h8300_init_once): Allow -mn switch only if -mh or -ms present.

	* config/h8300/h8300.c (h8300_init_once): Allow -mn switch
	only if -mh or -ms present.
	(h8300_eightbit_constant_address_p): Support the normal mode.
	(h8300_tiny_constant_address_p): Likewise.
	* config/h8300/h8300.h (TARGET_NORMAL_MODE): New.
	(POINTER_SIZE): Add 16 bit pointer for the normal mode.
	(Pmode): Evaluate to HImode for the normal mode.
	(SIZE_TYPE): Evaluate to unsigned int for normal mode.
	(PTRDIFF_TYPE): Evaluate to int for the normal mode.
	(ASM_WORD_OP): Evaluate to word for the normal mode.
	* config/h8300/h8300.md (tablejump_normal_mode): New.
	(indirect_jump_normal_mode): New.
	* config/h8300/t-h8300 (MULTILIB_OPTIONS): Pass -mn option to
	directory.
	(MULTILIB_DIRNAMES): Create target dependent directory
	'normal'.
        (MULTILIB_EXCEPTIONS): Don't turn on -mn on H8/300.
	* doc/invoke.texi (gccoptlist): Describe the new switch -mn.

From-SVN: r59285