Thought: Change persistence model for Closures

[briandamaged]

Currently, closures are compiled and persisted temporarily each time they are used. This is handy for code that is performed infrequently (ex: top-level drivers, etc), but it results in a lot of wasted cycles for functions that are called repeatedly. Consider changing the caching mechanism so that the generated code is persisted for a longer period of time. In other words: allow individual closure instances to reference the same code.

Here's the real question: Will the caching actually be more efficient than just recompiling each time?