Resolving javac "cannot find symbol" issue

[Doug Simon]

Recently the Graal code base has run into problems being compiled by javac. The ultimate cause seems to be a long standing bug[1] to do with the order of imports and resolution of inner classes. Until this is resolved, we need to use the workaround of converting inner classes to top level classes in separate source files.

-Doug

[1] https://bugs.openjdk.java.net/browse/JDK-7101822