[Bug #19536]

When objects are moved between size pools, their frozen status is lost
in the shape. This will cause the frozen check to be bypassed when there
is an inline cache. For example, the following script should raise a
FrozenError, but doesn't on Ruby 3.2 and master.

    class A
      def add_ivars
        @a = @b = @c = @d = 1
      end

      def set_a
        @a = 10
      end
    end

    a = A.new
    a.add_ivars
    a.freeze

    b = A.new
    b.add_ivars
    b.set_a # Set the inline cache in set_a

    GC.verify_compaction_references(expand_heap: true, toward: :empty)

    a.set_a