Generators save and restore stack handlers

src/v8memory.h

Index: src/v8memory.h
diff --git a/src/v8memory.h b/src/v8memory.h
index f71de82072ec4b72700f5d3e9563e79da45e52ae..c72ce7ab7b88d258e4e589948d87d6a98752da29 100644
--- a/src/v8memory.h
+++ b/src/v8memory.h
@@ -64,6 +64,14 @@ class Memory {
     return *reinterpret_cast<unsigned*>(addr);
   }
 
+  static intptr_t& intptr_at(Address addr)  {
+    return *reinterpret_cast<intptr_t*>(addr);
+  }
+
+  static uintptr_t& uintptr_at(Address addr) {
+    return *reinterpret_cast<uintptr_t*>(addr);
+  }
+
   static double& double_at(Address addr)  {
     return *reinterpret_cast<double*>(addr);
   }