* arch-utils.h (generic_register_size): Declare.

* arch-utils.h (generic_register_size): Declare.
(generic_register_raw_size, generic_register_virtual_size): Delete
declarations.
* arch-utils.c (generic_register_raw_size): Delete.
(generic_register_size): New function.
(generic_register_virtual_size): Delete.

* gdbarch.sh (REGISTER_RAW_SIZE, REGISTER_VIRTUAL_SIZE): Make
default generic_register_size.
* gdbarch.h, gdbarch.c: Re-generate.

* d10v-tdep.c (d10v_gdbarch_init): Use generic_register_size for
register_virtual_size.
* x86-64-tdep.c (x86_64_gdbarch_init): Ditto.
* rs6000-tdep.c (rs6000_gdbarch_init): Ditto.

* gdbint.texinfo (Target Architecture Definition): Mention
defaults for REGISTER_VIRTUAL_SIZE and REGISTER_RAW_SIZE.
(Target Architecture Definition): Mention same.  Add references to
web pages.