message: Label Metal command queue
diff: @@ -55,6 +55,7 @@ MetalDriver::MetalDriver(backend::MetalPlatform* platform) noexcept
  mContext->driverPool = [[NSAutoreleasePool alloc] init];
  mContext->device = MTLCreateSystemDefaultDevice();
  mContext->commandQueue = [mContext->device newCommandQueue];
  + mContext->commandQueue.label = @"Filament";
  mContext->pipelineStateCache.setDevice(mContext->device);
  mContext->depthStencilStateCache.setDevice(mContext->device);
  mContext->samplerStateCache.setDevice(mContext->device);
  