[x64] Remove dead code in code-generator-x64.cc:AssembleArchBranch.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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 "src/compiler/code-generator.h"
 
 #include <limits>
 
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 2249 matching lines @@
       break;
   }
   UNREACHABLE();
   return no_condition;
 }
 
 }  // namespace
 
 // Assembles branches after this instruction.
 void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
-  X64OperandConverter i(this, instr);
   Label::Distance flabel_distance =
       branch->fallthru ? Label::kNear : Label::kFar;
   Label* tlabel = branch->true_label;
   Label* flabel = branch->false_label;
   if (branch->condition == kUnorderedEqual) {
     __ j(parity_even, flabel, flabel_distance);
   } else if (branch->condition == kUnorderedNotEqual) {
     __ j(parity_even, tlabel);
   }
   __ j(FlagsConditionToCondition(branch->condition), tlabel);
@@ skipping 559 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8