re PR rtl-optimization/56434 (document that __attribute__((__malloc__)) assumes returned pointer has BIGGEST_ALIGNMENT)

2013-03-25  Richard Biener  <rguenther@suse.de>

	PR middle-end/56434
	* calls.c (expand_call): Use MALLOC_ABI_ALIGNMENT to annotate
	the pointer returned by calls with ECF_MALLOC set.

From-SVN: r197030