Invoking modules multiple times

[mrsmkl]

Some test cases need to invoke the modules many times. Currently this is not supported.

[terminaldweller]

i was talking on the irc chat regading this just to double check. running multiple modules inside a .wast is not a requirement for a wasm interpreter. also .wasm files will only have one module inside and we will be running only .wasm files,right? so cant we just cut them up into separate files or the tests wont make any sense that way?