x64: Fix clang complain error of unused private field.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 8ef852b99c3e342abe916f73533bc5ade666c7d0..df1c838b73d7136a55f06538bbd22fc7002d21af 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -860,11 +860,8 @@ static void GenerateFastApiCall(MacroAssembler* masm,
 
 class CallInterceptorCompiler BASE_EMBEDDED {
  public:
-  CallInterceptorCompiler(CallStubCompiler* stub_compiler,
-                          const ParameterCount& arguments,
-                          Register name)
+  CallInterceptorCompiler(CallStubCompiler* stub_compiler, Register name)
       : stub_compiler_(stub_compiler),
-        arguments_(arguments),
         name_(name) {}
 
   void Compile(MacroAssembler* masm,
@@ -997,7 +994,6 @@ class CallInterceptorCompiler BASE_EMBEDDED {
   }
 
   CallStubCompiler* stub_compiler_;
-  const ParameterCount& arguments_;
   Register name_;
 };
 
@@ -1570,7 +1566,7 @@ Handle<Code> CallStubCompiler::CompileCallInterceptor(Handle<JSObject> object,
   // Get the receiver from the stack.
   __ ldr(r1, MemOperand(sp, argc * kPointerSize));
 
-  CallInterceptorCompiler compiler(this, arguments(), r2);
+  CallInterceptorCompiler compiler(this, r2);
   compiler.Compile(masm(), object, holder, name, &lookup, r1, r3, r4, r0,
                    &miss);