Reapply "Add a level of indirection to exception handler addresses."

src/v8memory.h

Index: src/v8memory.h
diff --git a/src/v8memory.h b/src/v8memory.h
index 901e78d2960a967ea59bcc628d77716ede0056ae..f71de82072ec4b72700f5d3e9563e79da45e52ae 100644
--- a/src/v8memory.h
+++ b/src/v8memory.h
@@ -1,4 +1,4 @@
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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:
@@ -60,6 +60,10 @@ class Memory {
     return *reinterpret_cast<int*>(addr);
   }
 
+  static unsigned& unsigned_at(Address addr) {
+    return *reinterpret_cast<unsigned*>(addr);
+  }
+
   static double& double_at(Address addr)  {
     return *reinterpret_cast<double*>(addr);
   }