$298a584c for-in-object-property-iterator-next.js:8:1
  Registers: 8
  Blocks:    1
  Constants:
    [0] = Undefined
    [1] = Int32(2)
    [2] = String("two")
    [3] = String("foo")
    [4] = Int32(7)
    [5] = String("seven")

block0:
  [   0] GetGlobal dst:reg6, `collect`
  [  18] NewObject dst:reg7
  [  28] ToPrimitiveWithStringHint dst:Int32(2), value:Int32(2)
  [  38] PutByValue base:reg7, property:Int32(2), src:String("two"), kind:Own
  [  50] PutById base:reg7, `foo`, src:String("foo"), kind:Own
  [  78] ToPrimitiveWithStringHint dst:Int32(7), value:Int32(7)
  [  88] PutByValue base:reg7, property:Int32(7), src:String("seven"), kind:Own
  [  a0] Call dst:reg5, callee:reg6, this_value:Undefined, collect, arguments:[reg7]
  [  c8] End value:reg5


collect$a74ca55b for-in-object-property-iterator-next.js:2:18
  Registers: 12
  Blocks:    6
  Locals:    key~0, keys~1

block0:
  [   0] NewArray dst:keys~1
  [  10] JumpNullish condition:arg0, true_target:block3, false_target:block4

block1:
  [  20] Return value:keys~1

block2:
  [  28] ObjectPropertyIteratorNext dst_value:reg6, dst_done:reg7, iterator_object:reg5
  [  38] JumpIf condition:reg7, true_target:block1, false_target:block5

block3:
  [  48] Return value:keys~1

block4:
  [  50] GetObjectPropertyIterator dst_iterator:reg5, object:arg0
  [  68] Jump target:block2

block5:
  [  70] Mov dst:key~0, src:reg6
  [  80] GetById dst:reg9, base:keys~1, `push` (keys.push)
  [  a0] Mov dst:reg10, src:keys~1
  [  b0] ThrowIfTDZ src:key~0
  [  b8] Mov dst:reg11, src:key~0
  [  c8] Call dst:reg8, callee:reg9, this_value:reg10, keys.push, arguments:[reg11]
  [  f0] Jump target:block2