* sparc64-nat.c (sparc64_gregset_supplies_p): Add GDBARCH parameter.

	Use it instead of current_gdbarch.  Pass architecture to
	sparc32_gregset_supplies_p.
	(sparc64_fpregset_supplies_p): Add GDBARCH parameter.  Use it instead
	of current_gdbarch.  Pass architecture to sparc32_fpregset_supplies_p.
	* sparc64nbsd-nat.c (sparc64nbsd_gregset_supplies_p,
	sparc64nbsd_fpregset_supplies_p): Likewise.
	* sparc-nat.c (sparc_gregset_supplies_p, sparc_fpregset_supplies_p):
	Add GDBARCH parameter.
	(sparc32_gregset_supplies_p, sparc32_fpregset_supplies_p): Likewise.
	(sparc_fetch_inferior_registers): Pass regcache architecture to
	sparc_gregset_supplies_p and sparc_fpregset_supplies_p.
	(sparc_store_inferior_registers): Likewise.
	* sparc-nat.h (sparc_gregset_supplies_p, sparc_fpregset_supplies_p:
	Add GDBARCH parameter.
	(sparc32_gregset_supplies_p, sparc32_fpregset_supplies_p): Likewise.