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

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

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 710cbdbc4e89d927d11b1cb222e35f8fcd4b8bb4..212a06eac3cd4a92231c75e56d497e93c2ea58a5 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -2267,7 +2267,6 @@ Condition FlagsConditionToCondition(FlagsCondition condition) {
 
 // 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;