array.c, hash.c: add salt

* array.c (rb_ary_hash): add salt to differentiate false and empty
  array.  [ruby-core:58993] [Bug #9231]
* hash.c (rb_any_hash, rb_hash_hash): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44125 b2dd03c8-39d4-4d8f-98ff-823fe69b080e