[master] remove troublesome global C state from modules

[hishamhm]

This is a rebase into master of PR #233.

[codecov-io]

Codecov Report

Merging #235 into master will increase coverage by 0.14%. The diff coverage is 99.15%.

Impacted Files	Coverage Δ
titan-compiler/types.lua	86.71% <100%> (+0.3%)	:arrow_up:
titan-compiler/checker.lua	89.83% <100%> (+0.47%)	:arrow_up:
titan-compiler/coder.lua	96.37% <99.1%> (-0.09%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 1909351...02e7e4f. Read the comment docs.

[hishamhm]

@mascarenhas this made it much easier to follow! (and made me note that there was an update done to codearray that wasn't done in codemap; I updated and squashed it there — I'll probably refactor the common parts of these functions later)

[hishamhm]

I would prefer to merge this one instead (and work using this version over the weekend, until we get a chance to discuss primitives in the next meeting)

[mascarenhas]

I am fixing a couple of loose ends and will push a commit soon, and then we can merge.

[mascarenhas]

My commit addresses two issues:

• There was a bugfix for comparing two values in the primitives branch that we should keep
• The slot indexes of a module's members must be deterministic, otherwise we cannot have separate compilation with the current scheme (we need a test for that)

[mascarenhas]

Feel free to merge this into master!