`async` word in comments applies regeneratorRuntime to code

[zanona]

The following code does not transform as expected:

input

////some randon comment with the word async
for (const i of [1,2,3]) {
}

output

for (var i, t$0$0 = regeneratorRuntime.values([1,2,3]), t$0$1; !(t$0$1 = t$0$0.next()).done; ) {
  i = t$0$1.value;
}

expected It shouldn't change the input.