ARM BE8 support.

	ARM BE8 support.
	* disasm.c (gdb_disassemble_info): Set endian_code.
	* gdbarch.sh (gdbarch_info): New field byte_order_for_code.
	* gdbarch.h, gdbarch.c: Regenerate.
	* arch-utils.c (initialize_current_architecture): Set the
	default byte_order_for_code.
	(gdbarch_info_init): Ditto.
	(gdbarch_info_fill): Ditto.
	* arm-tdep.c (SWAP_INT, SWAP_SHORT): New macros.
	(thumb_analyze_prologue): Swap halfword if code endianness is
	different from general endianness.
	(arm_skip_prologue): Similarly.
	(arm_scan_prologue): Ditto.
	(thumb_get_next_pc): Ditto.
	(arm_get_next_pc): Ditto.
	(arm_gdbarch_init): Set byte_order_for_code from BE8 flag,
	choose correct endianness for breakpoints.