rs6000.c (rs6000_return_in_memory): Test TARGET_ALTIVEC_ABI.

2004-11-22  David Edelsohn  <edelsohn@gnu.org>
	    Fariborz Jahanian  <fjahanian@apple.com>

	* config/rs6000/rs6000.c (rs6000_return_in_memory): Test
	TARGET_ALTIVEC_ABI.
	(function_arg_boundary): Align 8 to 16 byte vectors like SPE.
	Align 16 byte and larger vectors like Altivec.
	(function_arg_advance): Pass any 16 byte vector like Altivec vector.
	(function_arg): Same.
	(rs6000_pass_by_references): Test TARGET_ALTIVEC_ABI.

Co-Authored-By: Fariborz Jahanian <fjahanian@apple.com>

From-SVN: r91025