Mark cctests that don't use deprecated APIs as such

test/cctest/test-identity-map.cc

 // Copyright 2015 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.
 
+// TODO(jochen): Remove this after the setting is turned on globally.
+#define V8_IMMINENT_DEPRECATION_WARNINGS
+
 #include "src/v8.h"
 
 #include "src/identity-map.h"
 #include "src/zone.h"
 
 #include "test/cctest/cctest.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 396 matching lines @@
     CHECK_NE(string4.location(), string6.location());
     CHECK_NE(number1.location(), number6.location());
     CHECK_NE(string1.location(), string6.location());
     CHECK_EQ(number5.location(), number6.location());
     CHECK_EQ(string5.location(), string6.location());
   }
 }
 
 }  // namespace internal
 }  // namespace v8