Move the thread local functions to the Thread class in runtime/platform

runtime/vm/vm_sources.gypi

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains all sources (vm and tests) for the dart virtual machine.
 # Unit test files need to have a '_test' suffix appended to the name.
 {
   'sources': [
     'allocation.cc',
     'allocation.h',
@@ skipping 125 matching lines @@
     'instructions_ia32_test.cc',
     'instructions_x64.cc',
     'instructions_x64.h',
     'instructions_x64_test.cc',
     'intrinsifier.h',
     'intrinsifier_ia32.cc',
     'intrinsifier_x64.cc',
     'intrinsifier_arm.cc',
     'isolate.cc',
     'isolate.h',
-    'isolate_linux.cc',
-    'isolate_linux.h',
-    'isolate_macos.cc',
-    'isolate_macos.h',
     'isolate_test.cc',
-    'isolate_win.cc',
-    'isolate_win.h',
     'longjump.cc',
     'longjump.h',
     'longjump_test.cc',
     'memory_region.cc',
     'memory_region.h',
     'memory_region_test.cc',
     'message.cc',
     'message.h',
     'message_test.cc',
     'native_arguments.cc',
@@ skipping 92 matching lines @@
     'virtual_memory_test.cc',
     'virtual_memory_win.cc',
     'verifier.cc',
     'verifier.h',
     'visitor.h',
     'zone.cc',
     'zone.h',
     'zone_test.cc',
   ],
 }