Remove unreachable code

Remove unreachable code found after return / throw / continue or break statements.

Apply with the Grit CLI

grit apply no_dead_code

Remove code after return

BEFORE

function f() {
  return 3;
  1 + 1;
}

AFTER

function f() {
  return 3;
}

BEFORE

function f() {
  foo();
  return 3;
  1 + 1;
}

AFTER

function f() {
  foo();
  return 3;
}

BEFORE

function f() {
  if (a) {
    return 3;
  }
  1 + 1;
}

AFTER

function f() {
  if (a) {
    return 3;
  }
  1 + 1;
}