Minimize exposure of JDK internals

Have you considered adopting a module declaration?

It would allow minimizing the exposure of JDK internals to errorprone, which would surface any abuse of these internals by other third-party libraries/annotation processors.
```
--add-exports jdk.compiler/com.sun.tools.javac.api=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.file=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.main=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.model=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.parser=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.processing=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.tree=com.google.errorprone
--add-exports jdk.compiler/com.sun.tools.javac.util=com.google.errorprone
--add-opens jdk.compiler/com.sun.tools.javac.code=com.google.errorprone
--add-opens jdk.compiler/com.sun.tools.javac.comp=com.google.errorprone
```