x64: Fix clang complain error of unused private field.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index c8a9ce4b3175607a4859172e36fd991f96cefe59..5695556366c031ba13f051a265fee3bd2b989b0d 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -499,11 +499,8 @@ 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,
@@ -637,7 +634,6 @@ class CallInterceptorCompiler BASE_EMBEDDED {
   }
 
   CallStubCompiler* stub_compiler_;
-  const ParameterCount& arguments_;
   Register name_;
 };
 
@@ -1579,7 +1575,7 @@ Handle<Code> CallStubCompiler::CompileCallInterceptor(Handle<JSObject> object,
   // Get the receiver from the stack.
   __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
 
-  CallInterceptorCompiler compiler(this, arguments(), ecx);
+  CallInterceptorCompiler compiler(this, ecx);
   compiler.Compile(masm(), object, holder, name, &lookup, edx, ebx, edi, eax,
                    &miss);