revert parts of 07a992e

test/core/fixtures/transformation/es6.tail-call/shadow/actual.js

@@ -2,7 +2,7 @@
   var foo = () => {
     this;
     arguments;
-    foo();
+    return foo();
   };
   foo();
 });

test/core/fixtures/transformation/es6.tail-call/void/actual.js

@@ -1,11 +0,0 @@
-function skipWhile(cond) {
-  if (!hasNext() || cond(current, last)) return;
-  move();
-  skipWhile(cond);
-}
-
-var skipWhile2 = function (cond) {
-  if (!hasNext() || cond(current, last)) return;
-  move();
-  skipWhile2(cond);
-};

test/core/fixtures/transformation/es6.tail-call/void/expected.js

@@ -1,31 +0,0 @@
-"use strict";
-
-function skipWhile(_x) {
-  var _again = true;
-
-  _function: while (_again) {
-    var cond = _x;
-    _again = false;
-
-    if (!hasNext() || cond(current, last)) return;
-    move();
-    _x = cond;
-    _again = true;
-    continue _function;
-  }
-}
-
-var skipWhile2 = function skipWhile2(_x2) {
-  var _again2 = true;
-
-  _function2: while (_again2) {
-    var cond = _x2;
-    _again2 = false;
-
-    if (!hasNext() || cond(current, last)) return;
-    move();
-    _x2 = cond;
-    _again2 = true;
-    continue _function2;
-  }
-};