Allow dynlink/eval usage #5
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Fixes #2. This set of commits changes the public api to allow using ocaml-jit as a mechanism similar to dynlink (or eval in dynamic languages). Instead of
init_topwe exposejit_loadandjit_lookup_symbol. Additionally I exposeSymbols,AddressandGlobalsin order to be able to pass symbols from external libraries (eventually I'd like to removeGlobal.symbolsand pass them tojit_load, which should also make unloading easier).I also added a simple eval example. It uses quite a bit of OCaml's internal apis (although not much more than ocaml-jit itself). I'm not sure how maintainable it will be between compiler changes, but it should serve as a nice demonstration.