Set Ractor moved object's shape to original object's shape

Fixes [Bug #19409]

bootstraptest/test_ractor.rb

@@ -1087,6 +1087,27 @@ def self.fstr = @fstr
   a + b + c + d + e + f
 }
 
+# moved objects have their shape properly set to original object's shape
+assert_equal '1234', %q{
+class Obj
+  attr_accessor :a, :b, :c, :d
+  def initialize
+    @a = 1
+    @b = 2
+    @c = 3
+  end
+end
+r = Ractor.new do
+  obj = receive
+  obj.d = 4
+  [obj.a, obj.b, obj.c, obj.d]
+end
+obj = Obj.new
+r.send(obj, move: true)
+values = r.take
+values.join
+}
+
 # cvar in shareable-objects are not allowed to access from non-main Ractor
 assert_equal 'can not access class variables from non-main Ractors', %q{
   class C

ractor.c

@@ -3504,7 +3504,9 @@ move_enter(VALUE obj, struct obj_traverse_replace_data *data)
         return traverse_skip;
     }
     else {
-        data->replacement = rb_obj_alloc(RBASIC_CLASS(obj));
+        VALUE moved = rb_obj_alloc(RBASIC_CLASS(obj));
+        rb_shape_set_shape(moved, rb_shape_get_shape(obj));
+        data->replacement = moved;
         return traverse_cont;
     }
 }