Fix crash when function body is empty
Fix crash when function body is empty

1. Currently JIT compiler assumes a non-empty function body, and when it
encounters an empty function, it crashes. Fix is to check the method's number
of bytecodes and abort compile when there is 0 bytecodes.
2. In file test/interpreter_test.src, add CASCON2017 eye-catcher in b9main.

Signed-off-by: Xiaoli Liang <62a2846df84d0f90b761bf427dd67be80694b69d@gmail.com>

jduimovich/Base9,youngar/Base9,youngar/Base9,jduimovich/Base9,youngar/Base9