re PR tree-optimization/36978 (ICE in gimple_cond_set_lhs for -O2 -funswitch-loops after tuples merge)

2008-07-31  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/36978
	* tree-ssa-loop-unswitch.c (tree_may_unswitch_on): Do not fold
	the generated condition.

	* gcc.dg/torture/pr36978.c: New testcase.

From-SVN: r138415