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

src/x64/lithium-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 2314 matching lines @@
     }
 
     return new(zone()) LStoreKeyed(object, key, val);
   }
 
   DCHECK(
        (instr->value()->representation().IsInteger32() &&
        !IsDoubleOrFloatElementsKind(elements_kind)) ||
        (instr->value()->representation().IsDouble() &&
        IsDoubleOrFloatElementsKind(elements_kind)));
-  DCHECK((instr->is_fixed_typed_array() &&
-          instr->elements()->representation().IsTagged()) ||
-         (instr->is_external() &&
-          instr->elements()->representation().IsExternal()));
+  DCHECK(instr->elements()->representation().IsExternal());
   bool val_is_temp_register =
       elements_kind == EXTERNAL_UINT8_CLAMPED_ELEMENTS ||
       elements_kind == EXTERNAL_FLOAT32_ELEMENTS ||
       elements_kind == FLOAT32_ELEMENTS;
   LOperand* val = val_is_temp_register ? UseTempRegister(instr->value())
       : UseRegister(instr->value());
   LOperand* key = NULL;
   if (kPointerSize == kInt64Size) {
     key = UseRegisterOrConstantAtStart(instr->key());
   } else {
@@ skipping 423 matching lines @@
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, rsi), instr);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64