plt/racket — pull request #517 by shekari (2013-12-14 05:53:03+00:00)
Title: Compiler speedups

The first commit I believe should be uncontroversial.

The second is a proof of concept showing that collects-relative->path is way too slow. This change gives me about a 50% speed up in no-op compiles of the typed racket unit tests. I believe there is much more savings to be had by assuming that the collection structure doesn't change during a single compilation call.