[turbofan] Add proper conversion operators for int32<->int64.

test/compiler-unittests/compiler-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': [
@@ skipping 10 matching lines @@
       ],
       'sources': [  ### gcmole(all) ###
         'change-lowering-unittest.cc',
         'common-operator-unittest.cc',
         'common-operator-unittest.h',
         'compiler-unittests.cc',
         'graph-unittest.cc',
         'graph-unittest.h',
         'instruction-selector-unittest.cc',
         'machine-operator-reducer-unittest.cc',
+        'machine-operator-unittest.cc',
       ],
       'conditions': [
         ['v8_target_arch=="arm"', {
           'sources': [  ### gcmole(arch:arm) ###
             'arm/instruction-selector-arm-unittest.cc',
           ],
         }],
         ['v8_target_arch=="arm64"', {
           'sources': [  ### gcmole(arch:arm64) ###
             'arm64/instruction-selector-arm64-unittest.cc',
           ],
         }],
         ['v8_target_arch=="ia32"', {
           'sources': [  ### gcmole(arch:ia32) ###
             'ia32/instruction-selector-ia32-unittest.cc',
           ],
         }],
+        ['v8_target_arch=="x64"', {
+          'sources': [  ### gcmole(arch:x64) ###
+            'x64/instruction-selector-x64-unittest.cc',
+          ],
+        }],
         ['component=="shared_library"', {
           # compiler-unittests can't be built against a shared library, so we
           # need to depend on the underlying static target in that case.
           'conditions': [
             ['v8_use_snapshot=="true"', {
               'dependencies': ['../../tools/gyp/v8.gyp:v8_snapshot'],
             },
             {
               'dependencies': [
                 '../../tools/gyp/v8.gyp:v8_nosnapshot',
               ],
             }],
           ],
         }, {
           'dependencies': ['../../tools/gyp/v8.gyp:v8'],
         }],
         ['os_posix == 1', {
           # TODO(svenpanne): This is a temporary work-around to fix the warnings
           # that show up because we use -std=gnu++0x instead of -std=c++11.
           'cflags!': [
             '-pedantic',
           ],
         }],
       ],
     },
   ],
 }