Remove unused function rb_shape_transition_shape

shape.c

@@ -212,16 +212,6 @@ rb_shape_transition_shape_frozen(VALUE obj)
     rb_shape_set_shape(obj, next_shape);
 }
 
-void
-rb_shape_transition_shape(VALUE obj, ID id, rb_shape_t *shape)
-{
-    rb_shape_t* next_shape = rb_shape_get_next(shape, obj, id);
-    if (shape == next_shape) {
-        return;
-    }
-    rb_shape_set_shape(obj, next_shape);
-}
-
 /*
  * This function is used for assertions where we don't want to increment
  * max_iv_count

shape.h

@@ -144,7 +144,6 @@ int rb_shape_frozen_shape_p(rb_shape_t* shape);
 void rb_shape_transition_shape_frozen(VALUE obj);
 void rb_shape_transition_shape_remove_ivar(VALUE obj, ID id, rb_shape_t *shape);
 rb_shape_t * rb_shape_transition_shape_capa(rb_shape_t * shape, uint32_t new_capacity);
-void rb_shape_transition_shape(VALUE obj, ID id, rb_shape_t *shape);
 rb_shape_t * rb_shape_get_next_iv_shape(rb_shape_t * shape, ID id);
 rb_shape_t* rb_shape_get_next(rb_shape_t* shape, VALUE obj, ID id);
 bool rb_shape_get_iv_index(rb_shape_t * shape, ID id, attr_index_t * value);