knu 0fcac8f1a3 Avoid use of self.class.new(self) in Set#collect!
That prevents infinite recursion when a subclass of Set uses
`collect!` in its constructor.

This should fix [Bug #12437].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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