jruby/jruby — pull request #192 by alindeman (2012-06-03 00:45:34+00:00)
Title: --fast is mostly a no-op

Per the [discussion on Twitter](https://twitter.com/headius/status/209034181181837312), `--fast` should mostly go away.

* --fast is now basically synonymous with -X+C (force compilation)
* The other features that --fast enabled added complexity and often
caused strange bugs (e.g., JRUBY-6698).
* I *think* that much of these performance gains can be garnered by
simply using JRuby 1.7 with Java 7 and invokedynamic.