use predefined IDs

* array.c (rb_ary_equal), hash.c (hash_equal): use predefined IDs,
  `to_ary` and `to_hash` respectively.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46029 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
id.def: predefine to_i

* defs/id.def: predefine `to_i` as well as `to_int`.

* numeric.c (id_to_i): use predefined `idTo_i`.

* object.c (conv_method_names): add `to_i` ID.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46030 b2dd03c8-39d4-4d8f-98ff-823fe69b080e