Made predata smaller by storing symbol data in variable length base-128.

src/utils.h

 // 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 373 matching lines @@
   }
 
   inline Vector<T> operator+(int offset) {
     ASSERT(offset < length_);
     return Vector<T>(start_ + offset, length_ - offset);
   }
 
   // Factory method for creating empty vectors.
   static Vector<T> empty() { return Vector<T>(NULL, 0); }
 
+  template<typename S>
+  static Vector<T> cast(Vector<S> input) {
+    return Vector<T>(reinterpret_cast<T*>(input.start()),
+                     input.length() * sizeof(S) / sizeof(T));
+  }
+
  protected:
   void set_start(T* start) { start_ = start; }
 
  private:
   T* start_;
   int length_;
 };
 
 
 // A temporary assignment sets a (non-local) variable to a value on
@@ skipping 543 matching lines @@
 }
 
 template <class Dest, class Source>
 inline Dest BitCast(Source* source) {
   return BitCast<Dest>(reinterpret_cast<uintptr_t>(source));
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_