Load scripts from cached files every time.

Bug: 7342767

Having an separate in-memory (vs. file-based) loader makes little sense as
we refactor libbcc (to separate it into its own process space). This change
is a first step in cleanly separating the compile and link steps.

Change-Id: Iad67527329171f18475ced0f0b2652a0aa060259
6 files changed