const-fy breakpoint_ops->breakpoint_hit parameter aspace

const-fy breakpoint_ops->breakpoint_hit parameter aspace

gdb:

2017-10-26  Yao Qi  <yao.qi@linaro.org>

	* break-catch-sig.c (signal_catchpoint_breakpoint_hit): Make
	aspace const.
	* break-catch-syscall.c (breakpoint_hit_catch_syscall):
	Likewise.
	* breakpoint.c (bpstat_check_location): Remove cast.
	(breakpoint_hit_catch_fork): Make aspce const.
	(breakpoint_hit_catch_solib): Likewise.
	(breakpoint_hit_catch_exec): Likewise.
	(breakpoint_hit_ranged_breakpoint): Likewise.
	(breakpoint_hit_watchpoint): Likewise.
	(base_breakpoint_breakpoint_hit): Likewise.
	(bkpt_breakpoint_hit): Likewise.
	(dprintf_breakpoint_hit): Likewise.
	(tracepoint_breakpoint_hit): Likewise.
	* breakpoint.h (breakpoint_ops) <breakpoint_hit>: Likewise.