Some profiling infrastructure.

I avoided creating any dependency on yourkit. In addition, there was
no way to give arguments to the JVM without losing the ones defined in
ANT_OPTS, which has been a massive pain for a while. So there is now
"jvm.opts" which is simply appended to ANT_OPTS, e.g.

  % ant -Djvm.opts=-verbose
  [echo] Forking with JVM opts: -Xms1536M -Xmx2g -Xss1M -XX:MaxPermSize=192M -XX:+UseParallelGC -verbose

There is a minimal stub defining a profiler interface:

  scala.tools.util.Profiling

Then the yourkit wrapper implements that interface. Once your locker has
been rebuilt once, you can do this:

  ant yourkit.run

And it will build quick.lib/comp with profiling enabled, assuming it
can find the necessary files. See the yourkit.init target for values to
change: or ant -Dyourkit.home=/path/to/it might be enough.

Review by dragos.

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