Build could be quicker with a pre-jarjar'ed jar
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                 Key: JRUBY-2552
                 URL: http://jira.codehaus.org/browse/JRUBY-2552
             Project: JRuby
          Issue Type: Bug
          Components: Miscellaneous
            Reporter: Charles Oliver Nutter
            Priority: Minor


Building JRuby when it has already been built, or if there are only a few 
changes, take longer than it should because it fully re-jarjars all the core 
jars every time. This is mostly because of the class rewriting it needs to do 
to rename the ASM package. If we removed that renaming, or did that part of the 
jarjarring only once, all builds would be faster. On my machine, removing the 
renaming improved build time from 23 seconds to 16 seconds with no other 
changes.

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