tree-vrp.c (get_value_range): Only set parameter default definitions to varying,...

tree-vrp.c (get_value_range): Only set parameter default definitions to varying, leave others at undefined.

2011-07-29  Richard Guenther  <rguenther@suse.de>

	* tree-vrp.c (get_value_range): Only set parameter default
	definitions to varying, leave others at undefined.
	(extract_range_from_binary_expr): Fix undefined handling.
	(vrp_visit_phi_node): Handle merged undefined state.

	* gcc.dg/uninit-suppress.c: Also disable VRP.
	* gcc.dg/uninit-suppress_2.c: Likewise.

From-SVN: r176918