Backtrace frames can cause NPE if something tries to update backref
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                 Key: JRUBY-2234
                 URL: http://jira.codehaus.org/browse/JRUBY-2234
             Project: JRuby
          Issue Type: Bug
          Components: Miscellaneous
            Reporter: Charles Oliver Nutter
             Fix For: JRuby 1.1


See JRUBY-2233. Because backtrace does not have self set, using backtrace-only 
frames can lead to NPEs later on if some piece of code tries to update the 
backref (which uses self to get runtime to get nil). We need to do an audit of 
what methods update backref and figure out how to fit that with frame 
optimizations and avoid NPEs like this.

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