merge revision(s) r45076: [Backport #9535]

	* class.c (rb_mod_init_copy): do nothing if copying self.
	  [ruby-dev:47989] [Bug #9535]

	* hash.c (rb_hash_initialize_copy): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e