Added a simple dead code removal phase.

src/utils.h

 // Copyright 2012 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 844 matching lines @@
 inline Dest BitCast(const Source& source) {
   return BitCastHelper<Dest, Source>::cast(source);
 }
 
 
 template<typename ElementType, int NumElements>
 class EmbeddedContainer {
  public:
   EmbeddedContainer() : elems_() { }
 
-  int length() { return NumElements; }
+  int length() const { return NumElements; }
+  const ElementType& operator[](int i) const {
+    ASSERT(i < length());
+    return elems_[i];
+  }
   ElementType& operator[](int i) {
     ASSERT(i < length());
     return elems_[i];
   }
 
  private:
   ElementType elems_[NumElements];
 };
 
 
 template<typename ElementType>
 class EmbeddedContainer<ElementType, 0> {
  public:
-  int length() { return 0; }
+  int length() const { return 0; }
+  const ElementType& operator[](int i) const {
+    UNREACHABLE();
+    static ElementType t = 0;
+    return t;
+  }
   ElementType& operator[](int i) {
     UNREACHABLE();
     static ElementType t = 0;
     return t;
   }
 };
 
 
 // Helper class for building result strings in a character buffer. The
 // purpose of the class is to use safe operations that checks the
@@ skipping 133 matching lines @@
 
   // Ever FunctionState starts with this id.
   static const int kFirstUsableId = 4;
 
   int id_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_