Add template parameter and unittests to atomic utils.

test/unittests/unittests.gyp

 # 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.
 
 {
   'variables': {
     'v8_code': 1,
   },
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
     {
       'target_name': 'unittests',
       'type': 'executable',
       'variables': {
         'optimize': 'max',
       },
       'dependencies': [
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         '../../tools/gyp/v8.gyp:v8_libplatform',
       ],
       'include_dirs': [
         '../..',
       ],
       'defines': [
         # TODO(jochen): Remove again after this is globally turned on.
         'V8_IMMINENT_DEPRECATION_WARNINGS',
       ],
       'sources': [  ### gcmole(all) ###
+        'atomic-utils-unittest.cc',
         'base/bits-unittest.cc',
         'base/cpu-unittest.cc',
         'base/division-by-constant-unittest.cc',
         'base/flags-unittest.cc',
         'base/functional-unittest.cc',
         'base/logging-unittest.cc',
         'base/iterator-unittest.cc',
         'base/platform/condition-variable-unittest.cc',
         'base/platform/mutex-unittest.cc',
         'base/platform/platform-unittest.cc',
@@ skipping 127 matching lines @@
         }],
         ['v8_wasm!=0', {
           'dependencies': [
             '../../third_party/wasm/test/unittests/wasm/wasm.gyp:wasm_unittests',
           ],
         }],
       ],
     },
   ],
 }