Don't dump graphs when generating code
Merge pull request #181 from TehMillhouse/why_were_we_dumping_graphs_there_again

Don't dump graphs when generating code
Add --compile-firm flag
Merge pull request #186 from TehMillhouse/compile-firm

Add --compile-firm flag
Implement control flow
Merge pull request #183 from Kha/cfg

Implement control flow
Implement NullLiteral
Introduce util.PersistentDefaultMap
FirmConstructor: Create a visitor per method