backends: Add register_info, return_value_location, core_note on mips

	* backends/Makefile.am (mips_SRCS): Add mips_regs.c,
	mips_retval.c and mips_corenote.c.
	* backends/mips_init.c (mips_init): HOOK register_info,
	return_value_location and core_note.
	* backends/mips_corenote.c: New file.
	* backends/mips_regs.c: Likewise.
	* backends/mips_retval.c: Likewise.

Signed-off-by: Ying Huang <ying.huang@oss.cipunited.com>
5 files changed