gcc/

	* config/rs6000/rs6000.c (rs6000_function_arg_boundary): In the AIX
	and ELFv2 ABI, do not use the "mode == BLKmode" check to test for
	aggregate types.  Instead, *all* aggregate types, except for single-
	element or homogeneous float/vector aggregates, are quadword-aligned
	if required by their type alignment.  Issue -Wpsabi note when a type
	is now treated differently than before.

gcc/testsuite/

	* gcc.target/powerpc/ppc64-abi-warn-2.c: New test.

From-SVN: r213016