Break apart erlang:load_module/2 into two separate BIFs

Introduce two new BIFs, erlang:prepare_loading/2 and
erlang:finish_loading/1, and re-implement erlang:load_module/2 in
Erlang code.

We have two reasons for doing this:

* To facilitate suspending a process if another process
  is already doing code loading.

* In the future, we can implement parallel and atomic loading
  of several modules. Atomic loading works except for modules with
  on_load handlers. Because of that issue, erlang:finish_loading/2
  will currently only accept a list with a single magic binary.

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