Disable dead code stripping for mksnapshot

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
===================================================================
--- tools/gyp/v8.gyp	(revision 2476)
+++ tools/gyp/v8.gyp	(working copy)
@@ -506,6 +506,20 @@
     {
       'target_name': 'mksnapshot',
       'type': 'executable',
+      'configurations': {
+        'Release': {
+          'conditions': [
+            ['OS=="mac"', {
+              'xcode_settings': {
+                # Dead code stripping is normally enabled for release mode,
+                # but it causes mksnapshot to crash in some situations.
+                # http://code.google.com/p/v8/issues/detail?id=404
+                'DEAD_CODE_STRIPPING': 'NO',
+              },
+            }],
+          ],
+        },
+      },
       'dependencies': [
         'v8_nosnapshot',
       ],