* mips-tdep.c: Replace hard-coded constants with MIPS_INSTLEN.

	* mips-tdep.c: Replace hard-coded constants with MIPS_INSTLEN.
	(common_breakpoint): Use paddr instead of %x to print 64-bit values.
	(heuristic_proc_desc): Add tests for 64-bit instructions.
	(init_extra_frame_info, mips_push_arguments): Recognize additional
	registers for EABI.
	* remote-mips.c: Extend DDB target to allow TFTP downloads.
	* config/mips/tm-mips.h (MIPS_LAST_ARG_REGNUM, MIPS_NUM_ARG_REGS):
	Define.