2014-05-08  Jeff Law  <law@redhat.com>

	PR tree-optimization/61009
	* tree-ssa-threadedge.c (thread_through_normal_block): Return a
	tri-state rather than a boolean.  When a block is too big to
	thread through, inform caller via negative return value.
	(thread_across_edge): If a block was too big for normal threading,
	then it's too big for a joiner too, so remove temporary equivalences
	and return immediately.

	PR tree-optimization/61009
	* g++.dg/tree-ssa/pr61009.C: New test.

From-SVN: r210254