* config/i386/i386.c (X86_64_VARARGS_SIZE): Removed.
	(setup_incoming_varargs_64): Assume cum != NULL. Set/check
	ix86_varargs_gpr_size and ix86_varargs_fpr_size.  Use
	ix86_varargs_gpr_size instead of X86_64_REGPARM_MAX.
	Don't set ix86_save_varrargs_registers.
	(ix86_setup_incoming_varargs): Assume cum != NULL.
	(ix86_va_start): Check ix86_varargs_gpr_size and
	ix86_varargs_fpr_size instead of cfun->va_list_gpr_size and
	cfun->va_list_fpr_size, respectively.  Subtract 8*X86_64_REGPARM_MAX
	from frame pointer if ix86_varargs_gpr_size == 0.
	(ix86_compute_frame_layout): Updated.
	* config/i386/i386.h (ix86_save_varrargs_registers): Removed.
	(ix86_varargs_gpr_size): Define.
	(ix86_varargs_fpr_size): Likewise.
	(machine_function): Remove save_varrargs_registers.
	Add varargs_gpr_size and varargs_fpr_size.

	* gcc.target/i386/amd64-abi-3.c: New test.
	* gcc.target/i386/amd64-abi-4.c: Likewise.
	* gcc.target/i386/amd64-abi-5.c: Likewise.
	* gcc.target/i386/amd64-abi-6.c: Likewise.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r139910