20015
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Issue 5691: all sender of #getSourceFor:in: can just use #sourceCode
http://code.google.com/p/pharo/issues/detail?id=5691
Issue 5651: Fix for Classbuilder (subclasses of CompiledMethod)
http://code.google.com/p/pharo/issues/detail?id=5651
Issue 5690: CompiledMethod #sourceClass and #sourceSelector
http://code.google.com/p/pharo/issues/detail?id=5690-- Marcus Denker -- http://marcusdenker.de
