[parser] fix token end position for regexp literals

test/mjsunit/es6/arrow-functions.js

Index: test/mjsunit/es6/arrow-functions.js
diff --git a/test/mjsunit/es6/arrow-functions.js b/test/mjsunit/es6/arrow-functions.js
index 33147ab3971b3a28581818d4b3aa4b2cf67ecc9b..c1b375a4112685c615ff8b4125de9a8ec9b1fb87 100644
--- a/test/mjsunit/es6/arrow-functions.js
+++ b/test/mjsunit/es6/arrow-functions.js
@@ -68,3 +68,16 @@ assertEquals([5, 10], fives);
   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");
+});