* timevar.def (TV_SCEV_CONST): New timevar.
	* tree-optimize.c (init_tree_optimization_passes): Add
	pass_scev_cprop.
	* tree-pass.h (pass_scev_cprop): Declare.
	* tree-scalar-evolution.c (scev_const_prop): New function.
	* tree-scalar-evolution.h (scev_const_prop): Declare.
	* tree-ssa-loop.c (gate_scev_const_prop, pass_scev_cprop):
	New.
	* tree-cfg.c (replace_uses_by): Export.
	* tree-flow.h (replace_uses_by): Declare.

From-SVN: r99860