Remove the different length string types...

include/v8.h

Index: include/v8.h
===================================================================
--- include/v8.h	(revision 3336)
+++ include/v8.h	(working copy)
@@ -2819,6 +2819,18 @@
 const int kSmiShiftSize = SmiConstants<sizeof(void*)>::kSmiShiftSize;
 const int kSmiValueSize = SmiConstants<sizeof(void*)>::kSmiValueSize;
 
+template <size_t ptr_size> struct InternalConstants;
+
+// Internal constants for 32-bit systems.
+template <> struct InternalConstants<4> {
+  static const int kStringResourceOffset = 3 * sizeof(void*);
+};
+
+// Internal constants for 64-bit systems.
+template <> struct InternalConstants<8> {
+  static const int kStringResourceOffset = 2 * sizeof(void*);
+};
+
 /**
  * This class exports constants and functionality from within v8 that
  * is necessary to implement inline functions in the v8 api.  Don't
@@ -2831,7 +2843,9 @@
   // the implementation of v8.
   static const int kHeapObjectMapOffset = 0;
   static const int kMapInstanceTypeOffset = sizeof(void*) + sizeof(int);
-  static const int kStringResourceOffset = 2 * sizeof(void*);
+  static const int kStringResourceOffset =
+      InternalConstants<sizeof(void*)>::kStringResourceOffset;
+
   static const int kProxyProxyOffset = sizeof(void*);
   static const int kJSObjectHeaderSize = 3 * sizeof(void*);
   static const int kFullStringRepresentationMask = 0x07;