add JIT threshold setting
introduce IR’s JITCompiler
add wiring for JITting code in the background

heavily inspired on JRuby’s InterpretedIRMethod
split JIT and compile modes
compiled functions inherit from AbstractFunction
fancy helper for positional parameter retrieval
store the synthetic method name and sigs somewhere
move closer to fib-like fn compilation
jscallable is enough
more call attempts
move up
lvars are heap-based for now
add undefined operand emitter
cleanups
catchall exceptions for non-implemented types
add safety gap
setup parameters first before calling
cleaning leftovers
fix wacky JIT disable logic
add missing storeResult to call