* i386-tdep.h (struct gdbarch_tdep): Add members gregset,

* i386-tdep.h (struct gdbarch_tdep): Add members gregset,
gregset_reg_offset, gregset_num_regs, sizeof_gregset, fpregset,
sizeof_fpregset.
* i386-tdep.c: Include "regset.h".
(i386_supply_gregset): New function.
(i386_supply_fpregset): New function.
(i386_gdbarch_init): Initialze register set-related members of
TDEP.
* x86-64-tdep.c (x86_64_supply_fpregset): New function.
(x86_64_init_abi): Initialize TDEP->sizeof_fpregset.