Allow specifying base offset when constructing Keyed hydrogen instructions

src/x64/lithium-codegen-x64.h

 // 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.
 
 #ifndef V8_X64_LITHIUM_CODEGEN_X64_H_
 #define V8_X64_LITHIUM_CODEGEN_X64_H_
 
 #include "x64/lithium-x64.h"
 
 #include "checks.h"
@@ skipping 207 matching lines @@
   int DefineDeoptimizationLiteral(Handle<Object> literal);
 
   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 
   Register ToRegister(int index) const;
   XMMRegister ToDoubleRegister(int index) const;
   Operand BuildFastArrayOperand(
       LOperand* elements_pointer,
       LOperand* key,
       ElementsKind elements_kind,
-      uint32_t offset,
-      uint32_t additional_index = 0);
+      uint32_t base_offset);
 
   Operand BuildSeqStringOperand(Register string,
                                 LOperand* index,
                                 String::Encoding encoding);
 
   void EmitIntegerMathAbs(LMathAbs* instr);
   void EmitSmiMathAbs(LMathAbs* instr);
 
   // Support for recording safepoint and position information.
   void RecordSafepoint(LPointerMap* pointers,
@@ skipping 148 matching lines @@
   Label entry_;
   Label exit_;
   Label done_;
   Label* external_exit_;
   int instruction_index_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_LITHIUM_CODEGEN_X64_H_