Bytecode compilation for .ml and .mli files.
val implementation : 
  start_from:Clflags.Compiler_pass.t ->
  source_file:string ->
  output_prefix:string ->
  unitInternal functions
*
val to_bytecode : 
  Compile_common.info ->
  Typedtree.implementation ->
  Instruct.instruction list * Ident.Set.tto_bytecode info typed takes a typechecked implementation and returns its bytecode.
val emit_bytecode : 
  Compile_common.info ->
  (Instruct.instruction list * Ident.Set.t) ->
  unitemit_bytecode bytecode output the bytecode executable.

