Change readonly_p to bool

This patch changes readonly_p type to bool.

gdb:

2017-04-25  Yao Qi  <yao.qi@linaro.org>

	* regcache.c (struct regcache) <readonly_p>: Change its type
	to bool.
	(regcache_xmalloc_1): Update parameter type and callers update.
2 files changed