gcc/
* gimple.h (gimple_phi_arg_edge): Require a gimple_phi rather
than a plain gimple.
* graphite-sese-to-poly.c (rewrite_phi_out_of_ssa): Require a
gimple_phi_iterator; strengthen local "phi" from gimple to a
gimple_phi.
(rewrite_cross_bb_scalar_deps): Strengthen local "psi" from
a gimple_stmt_iterator to a gimple_phi_iterator.
(edge_initial_value_for_loop_phi): Require a gimple phi.
(initial_value_for_loop_phi): Likewise.
* ipa-split.c (consider_split): Convert "bsi" to a
gimple_phi_iterator and "stmt" to a gimple_phi.
* predict.c (predict_extra_loop_exits): Convert "phi_stmt" to be
a gimple_phi; introduce "lhs_def_stmt" as plain gimple.
(apply_return_prediction): Convert "phi" to be a gimple_phi.
* tree-cfg.c (replace_uses_by): Add checked cast to gimple_phi.
(verify_gimple_in_cfg): Introduce gimple_phi_iterator "gpi" and use
it to convert "phi" to a gimple_phi.
* tree-eh.c (cleanup_empty_eh_merge_phis): Convert "ngsi", "ogsi"
to be gimple_phi_iterators. Convert "ophi", "nphi" to be
gimple_phi.
* tree-into-ssa.c (prepare_use_sites_for): Add checked cast to
gimple_phi.
* tree-ssa-coalesce.c (create_outofssa_var_map): Introduce
gimple_phi_iterator "gpi" and use it to convert "phi" to a
gimple_phi.
* tree-ssa-dce.c (propagate_necessity): Introduce local "phi",
from checked cast to gimple_phi.
* tree-ssa-live.c (set_var_live_on_entry): Add checked cast to
gimple_phi.
* tree-ssa-propagate.c (replace_phi_args_in): Require a gimple_phi
rather than a plain gimple.
(substitute_and_fold): Introduce gimple_phi_iterator "gpi".
* tree-ssa-sink.c (find_bb_for_arg): Require a gimple_phi rather
than a plain gimple.
(nearest_common_dominator_of_uses): Replace check of code against
GIMPLE_PHI with a dyn_cast_gimple_phi, introducing a new local.
(statement_sink_location): Add checked cast to gimple_phi.
* tree-ssa-uninit.c (compute_uninit_opnds_pos): Require a
gimple_phi rather than a plain gimple.
(collect_phi_def_edges): Likewise.
(find_def_preds): Likewise.
(is_use_properly_guarded): Likewise.
(prune_uninit_phi_opnds_in_unrealizable_paths): Likewise. Also,
convert "flag_arg_def", "phi_arg_def" to gimple_phi using
dyn_cast_gimple_phi. Similarly, introduce new local
"opnd_def_phi".
(use_pred_not_overlap_with_undef_path_pred): Require a
gimple_phi rather than a plain gimple; add a checked cast.
(find_uninit_use): Replace check of code against GIMPLE_PHI with
a dyn_cast_gimple_phi, introducing a new local.