QAST and bytecode dump

test

- QAST::CompUnit
  - QAST::Block
    - QAST::Stmts
      - QAST::Var(local __args__ :decl(param))
    - QAST::Stmts
      - QAST::Stmts
        - QAST::Op(say)
          - QAST::Var(lexical x :decl())

MoarVM dump of binary compilation unit:

  Frame_0 :
    cuuid : cuid_1_1415729134.86606
    name : 
    Locals :
       0: loc_0_obj
       1: loc_1_obj
       2: loc_2_str
    Instructions :
00000   checkarity   0, -1
00001   param_sp     loc_0_obj, 0
00002   paramnamesused 
00003   getlex_no    loc_1_obj, 'x'
00004   decont       loc_1_obj, loc_1_obj
00005   smrt_strify  loc_2_str, loc_1_obj
00006   say          loc_2_str
00007   return_s     loc_2_str