Defined the <machinery/ir.h> and <machinery/jit.h> modules.
Defined the machinery::jit::compiler base class.
Defined the JIT compiler implementations for x86-64 and AArch64.
Defined the C function interface for library metadata.
Added simple FFI skeletons for Python and Ruby.
Added a basic FFI skeleton for Common Lisp.
Added `make check` targets for all FFI implementations.
Ensured that the `make check` targets for FFI work on Mac OS X.