re PR tree-optimization/71887 (wrong code (SIGFPE) at -O1 and above on x86_64-linux-gnu (in both 32-bit and 64-bit modes))

2016-07-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71887
	* tree-ssa-phiopt.c (absorbing_element_p): Add rhs arg and
	verify it is not zero for division / modulo handling.
	(value_replacement): Adjust.

	* gcc.dg/torture/pr71887.c: New testcase.

From-SVN: r238373