re PR tree-optimization/44061 (Warns about out-of-bounds array access inside __builtin_constant_p guarded section)

2012-01-11  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/44061
	* tree-vrp.c (extract_range_basic): Compute zero as
	value-range for __builtin_constant_p of function parameters.

	* gcc.dg/pr44061.c: New testcase.

From-SVN: r195103