* infcmd.c (print_return_value): Remove compatibility code calling

* infcmd.c (print_return_value): Remove compatibility code calling
deprecated_grub_regcache_for_registers.

* values.c: Include "regcache.h".
(value_being_returned): Update.  Use
deprecated_grub_regcache_for_registers to extract the register
buffer address.
* value.h (value_being_returned): Change ``retbuf'' parameter to a
``struct regcache''.
* Makefile.in (values.o): Add dependency on $(regcache_h).

* inferior.h (run_stack_dummy): Change type of second parameter to
a ``struct regcache''.
* valops.c (hand_function_call): Change type of retbuf to ``struct
regcache''.  Allocate using regcache_xmalloc, clean using
make_cleanup_regcache_xfree.
* infcmd.c (run_stack_dummy): Update.  Use
regcache_cpu_no_passthrough instead of memcpy to copy the buffer.

* regcache.c (do_regcache_xfree): New function.
(make_cleanup_regcache_xfree): New function.
* regcache.h (make_cleanup_regcache_xfree): Declare.