swift234

Updated the playground transform to log brace
entries and exits.

  - Added support to buildLoggerCall for different
    logger functions;

  - Added support to buildLoggerCall to handle
    source locations that fall outside the
    user-entered expression text; and

  - Added the necessary logging functions to the
    functions we check for before adding our
    instrumentation.

This involved some minor refactoring.  I still have
to add a stack of scopes that I can pop out of when
I see a break, continue, or return.


Swift SVN r16197