[update 2.0] #20589

20589
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Issue 7660: comments in isAbstractClass are wrong
        https://code.google.com/p/pharo/issues/detail?id=7660
       
Issue 7659: use more efficient setSourcePointer: in CompiledMethod
        https://code.google.com/p/pharo/issues/detail?id=7659
       
(almost the last one :)

Diff information:
http://ss3.gemstone.com/ss/Pharo20/Kernel-EstebanLorenzano.1337.diff