tree-ssa-loop-ivopts.c (get_phi_with_result): Remove.

* tree-ssa-loop-ivopts.c (get_phi_with_result): Remove.
(remove_statement): Likewise.
(rewrite_use_nonlinear_expr): Adjust.
(remove_unused_ivs): Collect SSA NAMEs to remove and call...
* tree-ssa.c (release_defs_bitset): ... this.  New.
* tree-flow.h (release_defs_bitset): Declare.

From-SVN: r151520