Allows gen_snapshot to be built with asan in the Mojo tree.

runtime/bin/bin.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.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 369 matching lines @@
       'type': 'executable',
       'toolsets':['host'],
       'dependencies': [
         'libdart_withcore',
         'libdart_builtin',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        'address_sanitizer.cc',

[zra, 2015/02/12 23:13:38]

I want to put this here to stay in sync with the BUILD.gn file, but I don't know
if this will mess up the Dart asan build.

         'gen_snapshot.cc',
         # Very limited native resolver provided.
         'builtin_gen_snapshot.cc',
         'builtin_common.cc',
         'builtin.cc',
         'builtin.h',
         'platform_android.cc',
         'platform_linux.cc',
         'platform_macos.cc',
         'platform_win.cc',
@@ skipping 402 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }