object.c: hash value from objid with salt
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object.c: hash value from objid with salt
salt, extract from rb_any_hash().
fix r44125. [ruby-core:59638] [Bug #9381]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e