[rfc] Get rid of current_gdbarch in amd64

[Markus Deuling]

Hi,

this patch removes all but one remaining occurence of current_gdbarch in AMD64 targets.
I dont have access to an AMD64 machine. Maybe someone from this list has and could do a testrun
with this patch to see if there are regressions? Thanks a lot.

Would this be ok to commit?

ChangeLog:

	* amd64-nat.h (amd64_native_gregset_supplies_p): Add gdbarch as 
	parameter.
	* amd64-nat.c (amd64_native_gregset_supplies_p): Likewise.

	(amd64_native_gregset_reg_offset): Add gdbarch as parameter. Replace
	current_gdbarch by gdbarch. Update caller.

	* amd64-linux-nat.c (amd64_linux_fetch_inferior_registers)
	(amd64_linux_store_inferior_registers): Use get_regcache_arch to get at
	the current architecture. Update calls of
	amd64_native_gregset_supplies_p.
	* amd64bsd-nat.c (amd64bsd_fetch_inferior_registers)
	(amd64bsd_store_inferior_registers): Likewise.


-- 
  Markus Deuling
  GNU Toolchain for Linux on Cell BE
  deuling@de.ibm.com

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