Store offset between fixed typed array base and data start in object

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1006 matching lines @@
   static void set_redirector(Isolate* isolate,
                              ExternalReferenceRedirector* redirector) {
     // We can't stack them.
     DCHECK(isolate->external_reference_redirector() == NULL);
     isolate->set_external_reference_redirector(
         reinterpret_cast<ExternalReferenceRedirectorPointer*>(redirector));
   }
 
   static ExternalReference stress_deopt_count(Isolate* isolate);
 
+  static ExternalReference fixed_typed_array_base_data_offset();
+
  private:
   explicit ExternalReference(void* address)
       : address_(address) {}
 
   static void* Redirect(Isolate* isolate,
                         Address address_arg,
                         Type type = ExternalReference::BUILTIN_CALL) {
     ExternalReferenceRedirector* redirector =
         reinterpret_cast<ExternalReferenceRedirector*>(
             isolate->external_reference_redirector());
@@ skipping 232 matching lines @@
   };
 
   Label emitted_label_;  // Records pc_offset of emitted pool
   PerTypeEntryInfo info_[ConstantPoolEntry::NUMBER_OF_TYPES];
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_