Stop treating scopes containing template strings tagged with 'eval' specially

test/mjsunit/es6/templates.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.
 
 var num = 5;
 var str = "str";
 function fn() { return "result"; }
 var obj = {
   num: num,
   str: str,
@@ skipping 679 matching lines @@
   assertEquals("-1-2-3-", tag`-${subs[0]}-${subs[1]}-${subs[2]}-`);
   assertArrayEquals(["get0", "get1", "get2"], log);
   assertArrayEquals([1, 2, 3], tagged);
 
   tagged.length = 0;
   log.length = 0;
   assertEquals("-1-", tag`-${subs[0]}-`);
   assertArrayEquals(["get0"], log);
   assertArrayEquals([1], tagged);
 })();
+
+
+// Since the first argument to the tag function is always an array,
+// eval calls will always just return that array.
+(function testEvalTagStrict() {
+  "use strict";
+  var f = (x) => eval`a${x}b`;
+  var result = f();
+  assertEquals(["a", "b"], result);
+  assertSame(result, f());
+})();
+
+
+(function testEvalTagSloppy() {
+  var f = (x) => eval`a${x}b`;
+  var result = f();
+  assertEquals(["a", "b"], result);
+  assertSame(result, f());
+})();