tree-optimization/119389 - limit edge processing in dominated_by_p_w_unex

The following removes quadraticness when visiting each predecessor
of a large CFG merge with dominated_by_p_w_unex.

	PR tree-optimization/119389
	* tree-ssa-sccvn.cc (dominated_by_p_w_unex): Limit the number
	of predecessors of a CFG merge we try to skip.
1 file changed