re PR tree-optimization/80776 (-Wformat-overflow false positive for %d on integer bounded by __builtin_unreachable)

2017-11-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80776
	* gimple-ssa-evrp-analyze.h (evrp_range_analyzer::set_ssa_range_info):
	Declare.
	* gimple-ssa-evrp-analyze.c (evrp_range_analyzer::set_ssa_range_info):
	New function.
	(evrp_range_analyzer::record_ranges_from_incoming_edges):
	If the incoming edge is an effective fallthru because the other
	edge only reaches a __builtin_unreachable () then record ranges
	derived from the controlling condition in SSA info.
	(evrp_range_analyzer::record_ranges_from_phis): Use set_ssa_range_info.
	(evrp_range_analyzer::record_ranges_from_stmt): Likewise.

	* gcc.dg/pr80776-1.c: New testcase.
	* gcc.dg/pr80776-2.c: Likewise.

From-SVN: r255201