$2b997e90 async-return-bare.js:4:1
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined

block0:
  [   0] GetGlobal dst:reg6, `f`
  [  18] Call dst:reg5, callee:reg6, this_value:Undefined, f
  [  38] End value:reg5


f$e16999cc async-return-bare.js:2:5
  Registers: 5
  Blocks:    2
  Constants:
    [0] = Undefined

block0:
  [   0] Yield continuation_label:block1, value:Undefined

block1:
  [  10] Yield value:Undefined