$bc2d85a0 string-from-char-code-builtin.js:3:1
  Registers: 9
  Blocks:    1
  Constants:
    [0] = Int32(65)
    [1] = Int32(66)

block0:
  [   0] GetGlobal dst:reg6, `String`
  [  18] GetById dst:reg7, base:reg6, `fromCharCode` (String.fromCharCode)
  [  38] CallBuiltinStringFromCharCode dst:reg5, callee:reg7, this_value:reg6, argument:Int32(65), String.fromCharCode
  [  50] GetGlobal dst:reg6, `String`
  [  68] GetById dst:reg8, base:reg6, `fromCharCode` (String.fromCharCode)
  [  88] Call dst:reg7, callee:reg8, this_value:reg6, String.fromCharCode, arguments:[Int32(65), Int32(66)]
  [  b0] End value:reg7