Support for global var shortcuts in script contexts.

test/cctest/test-feedback-vector.cc

 // 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.
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/api.h"
 #include "src/debug.h"
 #include "src/execution.h"
@@ skipping 293 matching lines @@
 TEST(VectorLoadICSlotSharing) {
   if (i::FLAG_always_opt) return;
   CcTest::InitializeVM();
   LocalContext context;
   v8::HandleScope scope(context->GetIsolate());
   Isolate* isolate = CcTest::i_isolate();
 
   // Function f has 3 LoadICs, one for each o, but the ICs share the same
   // feedback vector IC slot.
   CompileRun(
-      "var o = 10;"
+      "o = 10;"
       "function f() {"
       "  var x = o + 10;"
       "  return o + x + o;"
       "}"
       "f();");
   Handle<JSFunction> f = v8::Utils::OpenHandle(
       *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
   // There should be one IC slot.
   Handle<TypeFeedbackVector> feedback_vector =
       Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
@@ skipping 54 matching lines @@
   CHECK(number_map_found && o_map_found);
 
   // The degree of polymorphism doesn't change.
   CompileRun("f(100)");
   CHECK_EQ(POLYMORPHIC, nexus.StateFromFeedback());
   MapHandleList maps2;
   nexus.FindAllMaps(&maps2);
   CHECK_EQ(2, maps2.length());
 }
 }