hotfix for runtime reflection

Recent runtime reflection sync pull request, which among other things,
introduced more restricted package completion rules, led to a nightmarish
regression on java7, which prevented the entire scalac from starting up.

Previous commit removes scalac's dependency on runtime reflection, making
scalac operational, and this commit temporarily disables the introduced
assert in order to hotfix runtime reflection. In the hours to come
I'll be looking into the root of the problem, preparing a pull request
that reinstates the assert, which indicates a bug in our code that's been
there since 2.10.0-M3, and fixes the said bug.

Details: https://groups.google.com/forum/#!topic/scala-internals/hcnUFk75MgQ