2014-11-27  Richard Biener  <rguenther@suse.de>

	PR middle-end/64088
	* fold-const.c (const_unop): Re-instantiate missing condition
	before calling fold_abs_const.

	* gcc.dg/torture/pr64088.c: New testcase.

	PR tree-optimization/64088
	* tree-ssa-tail-merge.c (update_debug_stmt): After resetting
	the stmt break from the loop over use operands.

	* gcc.dg/torture/pr64091.c: New testcase.

From-SVN: r218128