src: simplify loop arithmetic in GetCPUInfo

Cache the repeated operations and reuse; potentially generating
efficient code in some platforms, and improving readability.

src/node_os.cc

@@ -121,14 +121,15 @@ static void GetCPUInfo(const FunctionCallbackInfo<Value>& args) {
   // [model, speed, (5 entries of cpu_times), model2, speed2, ...]
   std::vector<Local<Value>> result(count * 7);
   for (int i = 0; i < count; i++) {
+    int j = i * 7;
     uv_cpu_info_t* ci = cpu_infos + i;
-    result[i * 7] = OneByteString(isolate, ci->model);
-    result[i * 7 + 1] = Number::New(isolate, ci->speed);
-    result[i * 7 + 2] = Number::New(isolate, ci->cpu_times.user);
-    result[i * 7 + 3] = Number::New(isolate, ci->cpu_times.nice);
-    result[i * 7 + 4] = Number::New(isolate, ci->cpu_times.sys);
-    result[i * 7 + 5] = Number::New(isolate, ci->cpu_times.idle);
-    result[i * 7 + 6] = Number::New(isolate, ci->cpu_times.irq);
+    result[j++] = OneByteString(isolate, ci->model);
+    result[j++] = Number::New(isolate, ci->speed);
+    result[j++] = Number::New(isolate, ci->cpu_times.user);
+    result[j++] = Number::New(isolate, ci->cpu_times.nice);
+    result[j++] = Number::New(isolate, ci->cpu_times.sys);
+    result[j++] = Number::New(isolate, ci->cpu_times.idle);
+    result[j] = Number::New(isolate, ci->cpu_times.irq);
   }
 
   uv_free_cpu_info(cpu_infos, count);