gdbarch software_single_step frame_info to regcache: mips

gdbarch software_single_step frame_info to regcache: mips

gdb:

2016-11-22  Yao Qi  <yao.qi@linaro.org>

	* mips-tdep.c (mips32_bc1_pc): Replace parameter frame with
	regcache.  Call regcache_raw_get_unsigned instead of
	get_frame_register_unsigned.
	(mips32_next_pc): Likewise.
	(micromips_bc1_pc): Likewise.
	(micromips_next_pc): Likewise.
	(extended_mips16_next_pc): Likewise.
	(mips16_next_pc): Likewise.
	(mips_next_pc): Likewise.
	(mips_software_single_step): Call get_regcache_arch instead
	of get_frame_arch.