tree-vect-loop.c (vect_analyze_loop_2): Be more informative when not vectorizing because of too many alias checks.

2014-02-05  Richard Biener  <rguenther@suse.de>

	* tree-vect-loop.c (vect_analyze_loop_2): Be more informative
	when not vectorizing because of too many alias checks.
	* tree-vect-data-refs.c (vect_prune_runtime_alias_test_list):
	Add more verboseness, avoid duplicate MSG_MISSED_OPTIMIZATION.

From-SVN: r207499