New regcache_raw_get_signed

This patch adds a new regcache api regcache_raw_get_signed.

gdb:

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

	* regcache.c (regcache_raw_get_signed): New function.
	* regcache.h (regcache_raw_get_signed): Declare.
3 files changed