Only works on Linux/x64 and Windows/x64 right now.
Force an x64 build on Linux/x64 with: make CC="gcc -m64"
NYI: handle on-trace OOM errors.
NYI: improve register allocation for x64.
Compile math.sinh(), math.cosh(), math.tanh() and math.random().
Compile various io.*() functions.
Drive the GC forward on string allocations in the parser.
Improve KNUM fuse vs. load heuristics.
Add abstract C call handling to IR.