mips.c (machine_function): Add varargs_size field.

mips.c (machine_function): Add varargs_size field.

	* config/mips/mips.c (machine_function): Add varargs_size field.
	(mips_setup_incoming_varargs): Store the amount of extra stack space
	there rather than in *pretend_size.  When saving registers, always
	expect virtual_incoming_args_rtx to point to the start of the
	pretend arguments.
	(mips_va_start): Remove alignment hack.  Handle all
	!EABI_FLOAT_VARARGS_P cases in the same way.
	(compute_frame_size): Handle varargs_size.  Remove the redundant
	!TARGET_OLDABI condition in the handling of pretend_args_size.
	(mips_initial_elimination_offset): Remove the now-redundant check
	of TARGET_NEWABI.

From-SVN: r100956