$6a33dffa delete-expression-register.js:6:1
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined
    [1] = Int32(1)

block0:
  [   0] GetGlobal dst:reg6, `f`
  [  18] Call dst:reg5, callee:reg6, this_value:Undefined, f, arguments:[Int32(1)]
  [  40] End value:reg5


f$04c49ea7 delete-expression-register.js:3:7
  Registers: 7
  Blocks:    3
  Locals:    x~0, arguments~1
  Constants:
    [0] = Undefined
    [1] = Bool(false)
    [2] = Int32(0)

block0:
  [   0] CreateArguments dst:arguments~1, is_immutable:false
  [  10] Mov3 dst1:x~0, src1:Undefined, dst2:x~0, src2:Bool(false), dst3:reg5, src3:x~0
  [  30] JumpTrue condition:x~0, target:block2

block1:
  [  40] DeleteByValue dst:reg6, base:arguments~1, property:Int32(0)
  [  50] Mov dst:reg5, src:reg6

block2:
  [  60] Mov dst:x~0, src:reg5
  [  70] Return value:x~0