Have mercy and don't kill the Context::Scope immediately after birth.

src/mksnapshot.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 291 matching lines @@
 
   if (context.IsEmpty()) {
     fprintf(stderr,
             "\nException thrown while compiling natives - see above.\n\n");
     exit(1);
   }
   if (i::FLAG_extra_code != NULL) {
     // Capture 100 frames if anything happens.
     V8::SetCaptureStackTraceForUncaughtExceptions(true, 100);
     HandleScope scope(isolate);
-    v8::Context::Scope(v8::Local<v8::Context>::New(isolate, context));
+    v8::Context::Scope cscope(v8::Local<v8::Context>::New(isolate, context));
     const char* name = i::FLAG_extra_code;
     FILE* file = i::OS::FOpen(name, "rb");
     if (file == NULL) {
       fprintf(stderr, "Failed to open '%s': errno %d\n", name, errno);
       exit(1);
     }
 
     fseek(file, 0, SEEK_END);
     int size = ftell(file);
     rewind(file);
@@ skipping 71 matching lines @@
       "",
       ser.CurrentAllocationAddress(i::NEW_SPACE),
       ser.CurrentAllocationAddress(i::OLD_POINTER_SPACE),
       ser.CurrentAllocationAddress(i::OLD_DATA_SPACE),
       ser.CurrentAllocationAddress(i::CODE_SPACE),
       ser.CurrentAllocationAddress(i::MAP_SPACE),
       ser.CurrentAllocationAddress(i::CELL_SPACE),
       ser.CurrentAllocationAddress(i::PROPERTY_CELL_SPACE));
   return 0;
 }