Renaming in target-dcache.c

Renaming in target-dcache.c

Hi,
This patch does some renamings on "stack-cache" related functions and
variables.

In the review to "code cache" series v2, we have some discussions on the
name of predicate function 'stack_cache_enabled', and have some options,

 1 keep it unchanged, as it is already a predicate clearly,
 2 rename it to stack_cache_enabled_p,
 3 rename it to enable_stack_cache_p,

I choose #2, because 'stack_cache_enabled' is a predicate, but
it's better to add "_p" suffix to stress this.  There are some other
similar patterns used in GDB source, such as unop_user_defined_p
and agent_loaded_p.

Then, I have to rename variable stack_cache_enabled_p to something
else.  The option is "stack-cache", so I'd like to name the variable
associated with this command as "stack_cache".  Similarly, the commands
associated with this command should be renamed to "set_stack_cache"
and "show_stack_cache" respectively.

gdb:

2013-11-24  Yao Qi  <yao@codesourcery.com>

	* target-dcache.c (stack_cache_enabled_p_1): Rename to ...
	(stack_cache_enabled_1): ... this.  New variable.
	(stack_cache_enabled_p): Rename to ...
	(stack_cache_enabled): ... this.  New variable.
	(set_stack_cache_enabled_p): Rename to ...
	(set_stack_cache): ... this.  Update caller.
	(show_stack_cache_enabled_p): Rename to ...
	(show_stack_cache): ... this.  Update caller.
	(stack_cache_enabled): Rename to ...
	(stack_cache_enabled_p): ... this.  Update caller.
	(_initialize_target_dcache): Replace "data cache" with
	"target memory cache".
	* target-dcache.h (stack_cache_enabled): Remove declaration.
	(stack_cache_enabled_p): Add declaration.