* regcache.c (regcache_xmalloc): Add aspace argument. Use it

	* regcache.c (regcache_xmalloc): Add aspace argument.  Use it
	for the new regcache.  All callers updated.
	(regcache_cpy, regcache_cpy_no_passthrough): Do not set aspace here.
	(get_thread_arch_regcache): Do not set aspace here.
	* regcache.h (regcache_xmalloc): Update declaration.

	* frame.c, infcall.c, ppc-linux-tdep.c: Calls to
	regcache_xmalloc updated.