Expose internal heuristic values as command-line options

[jimbxb]

Certainly aspects of the compiler are decided by (somewhat) arbitrary values. This includes, but isn't limited to, the "size" limit of a proc when considering inlining and the threshold for creating a new continuation.

These values are currently baked into the compiler, but could be exposed for manipulation via the command-line. This would allow for easier experimentation with different values, instead of requiring a recompilation of the compiler each time.