30159
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10724 Remove AST Semantic Analysis package
https://pharo.fogbugz.com/f/cases/10724
10722 Old compiler should have iv compilationContext
https://pharo.fogbugz.com/f/cases/10722
Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/OpalCompiler-Core-MarcusDenker.307.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Compiler-MarcusDenker.469.diff