message: Fixed compilation issue on clang 6.x
diff: @@ -670,8 +670,9 @@ namespace dawn_native { namespace vulkan {
  VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
  clearDepthStencilValue, 1, &range);
  } else {
  + float fClearColor = static_cast<float>(clearColor);
  VkClearColorValue clearColorValue = {
  - {clearColor, clearColor, clearColor, clearColor}};
  + {fClearColor, fClearColor, fClearColor, fClearColor}};
  device->fn.CmdClearColorImage(recordingContext->commandBuffer, GetHandle(),
  VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
  &clearColorValue, 1, &range);
  