[parser] fix token end position for regexp literals

test/mjsunit/es6/arrow-functions.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Arrow functions are like functions, except they throw when using the
 // "new" operator on them.
 assertEquals("function", typeof (() => {}));
 assertEquals(Function.prototype, Object.getPrototypeOf(() => {}));
 assertThrows(function() { new (() => {}); }, TypeError);
 assertFalse("prototype" in (() => {}));
@@ skipping 50 matching lines @@
 (function testRestrictedFunctionPropertiesSloppy() {
   var arrowFn = () => {};
   assertFalse(arrowFn.hasOwnProperty("arguments"));
   assertThrows(function() { return arrowFn.arguments; }, TypeError);
   assertThrows(function() { arrowFn.arguments = {}; }, TypeError);
 
   assertFalse(arrowFn.hasOwnProperty("caller"));
   assertThrows(function() { return arrowFn.caller; }, TypeError);
   assertThrows(function() { arrowFn.caller = {}; }, TypeError);
 })();
+
+
+// v8:4474
+(function testConciseBodyReturnsRegexp() {
+  var arrow1 = () => /foo/
+  var arrow2 = () => /foo/;
+  var arrow3 = () => /foo/i
+  var arrow4 = () => /foo/i;
+  assertEquals(arrow1.toString(), "() => /foo/");
+  assertEquals(arrow2.toString(), "() => /foo/");
+  assertEquals(arrow3.toString(), "() => /foo/i");
+  assertEquals(arrow4.toString(), "() => /foo/i");
+});