JIT-ed class names only use method names, causing collisions

The JIT compiler calculates method java class names using only the bare method name plus the method contents. So if two unrelated classes have the identical method names and bodies, one method will overwrite the other. In the case where the method has for example an fcall call-site, the destination for the call site is different between the two methods.

Originally spotted in Travis, see the following gists for details.

https://gist.github.com/1355138
https://gist.github.com/5934af6ad8774e296461