backport: re PR tree-optimization/69802 (gcc ICE at -O1 and above on valid code...

backport: re PR tree-optimization/69802 (gcc ICE at -O1 and above  on valid code on x86_64-linux-gnu with “seg fault”)

	Backported from mainline
	2016-02-16  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/69802
	* tree-ssa-reassoc.c (update_range_test): If op is
	SSA_NAME_IS_DEFAULT_DEF, give up unless tem is a positive
	op == 1 test of precision 1 integral op, otherwise handle
	that case as op itself.  Fix up formatting.
	(optimize_range_tests_to_bit_test, optimize_range_tests): Fix
	up formatting.

	* gcc.dg/pr69802.c: New test.

From-SVN: r238135