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

src/assembler.cc

 // 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 1490 matching lines @@
   return ExternalReference(Redirect(isolate, FUNCTION_ADDR(Debug_Break)));
 }
 
 
 ExternalReference ExternalReference::debug_step_in_fp_address(
     Isolate* isolate) {
   return ExternalReference(isolate->debug()->step_in_fp_addr());
 }
 
 
+ExternalReference ExternalReference::fixed_typed_array_base_data_offset() {
+  return ExternalReference(reinterpret_cast<void*>(
+      FixedTypedArrayBase::kDataOffset - kHeapObjectTag));
+}
+
+
 bool operator==(ExternalReference lhs, ExternalReference rhs) {
   return lhs.address() == rhs.address();
 }
 
 
 bool operator!=(ExternalReference lhs, ExternalReference rhs) {
   return !(lhs == rhs);
 }
 
 
@@ skipping 300 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8