re PR tree-optimization/57200 (aggressive-loop-optimizations notes appear even when warning itself is suppressed)

2013-05-08  Paolo Carlini  <paolo.carlini@oracle.com>

	PR tree-optimization/57200
	* tree-ssa-loop-niter.c (do_warn_aggressive_loop_optimizations):
	Only call inform if the preceding warning_at returns true.

From-SVN: r198704