gdb/

gdb/
	Switch i386 and derived targets to ON_STACK.
	* amd64-dicos-tdep.c (amd64_dicos_push_dummy_code): Remove.
	(amd64_dicos_init_abi): Remove its installment.
	* dicos-tdep.c (dicos_init_abi): Remove the
	set_gdbarch_call_dummy_location call.  Update the comment here.
	* i386-dicos-tdep.c (i386_dicos_push_dummy_code): Remove.
	(i386_dicos_init_abi): Remove its installment.
	* i386-tdep.c (i386_push_dummy_code): New function.
	(i386_gdbarch_init): Call set_gdbarch_call_dummy_location, install
	i386_push_dummy_code.