re PR testsuite/63175 (FAIL: gcc.dg/vect/costmodel/ppc/costmodel-bb-slp-9a.c scan-tree-dump-times slp2" basic block vectorized using SLP" 1)

2015-02-27  Richard Biener  <rguenther@suse.de>

	PR middle-end/63175
	* builtins.c (get_object_alignment_2): Make sure to re-apply
	the ANDed mask after recursing to its operand gets us a new
	misalignment bit position.

From-SVN: r221043