I need to come up with a better way to handle JuliaPassContext.

IIRC from my last discussion with @vtjnash on this it's current implementation is not that helpful
since it attempts to cache function pointers and type pointers that depend on the current module
and current context. Given that we are moving away from a shared global context and that we are not
gurantueed to run over the same module the state cached in JuliaPassContext requires constant re-initalisation.