https://github.com/v8/v8/commit/9ec4e9095a2562f20476844824f596647d92f34c

spiller.wasm

spiller.wat

(module
  (type $t0 (func))
  (type $t1 (func (result i64)))
  (func $spiller (type $t0))
  (func $main (export "main") (type $t1) (result i64)
    (local $l0 i64)
    (local.set $l0
      (i64.load32_u
        (i32.const 0)))
    (call $spiller)
    (loop $L0
      (if $I1
        (i32.eqz
          (i32.load
            (i32.const 0)))
        (then
          (local.set $l0
            (i64.and
              (local.get $l0)
              (i64.const 1)))))
      (if $I2
        (i64.eqz
          (i64.and
            (local.get $l0)
            (i64.const 1)))
        (then
          (local.set $l0
            (i64.shl
              (local.get $l0)
              (i64.const 8)))))
      (block $B3
        (i32.eqz
          (i64.eqz
            (i64.and
              (local.get $l0)
              (i64.const 16777215))))
        (call $spiller)
        (br_if $L0))
      (call $spiller))
    (local.get $l0))
  (memory $M0 1 1)
  (data $d0 (i32.const 0) "xV4\12"))