igl | vulkan | Fix image memory barrier

Summary:
Fixed:
```
vkCmdPipelineBarrier: Hazard WRITE_AFTER_WRITE for image barrier.
```

Reviewed By: EricGriffith

Differential Revision: D49115074

fbshipit-source-id: d1c5efb190c8377b960d720b18c469fa60bec5dd

src/igl/vulkan/VulkanStagingDevice.cpp

@@ -205,7 +205,7 @@ void VulkanStagingDevice::imageData(VulkanImage& image,
   ivkImageMemoryBarrier(wrapper.cmdBuf_,
                         image.getVkImage(),
                         0,
-                        VK_ACCESS_TRANSFER_WRITE_BIT,
+                        VK_ACCESS_TRANSFER_READ_BIT | VK_ACCESS_TRANSFER_WRITE_BIT,
                         VK_IMAGE_LAYOUT_UNDEFINED,
                         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
                         VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
@@ -226,7 +226,7 @@ void VulkanStagingDevice::imageData(VulkanImage& image,
   // 3. Transition TRANSFER_DST_OPTIMAL into SHADER_READ_ONLY_OPTIMAL
   ivkImageMemoryBarrier(wrapper.cmdBuf_,
                         image.getVkImage(),
-                        VK_ACCESS_TRANSFER_READ_BIT, // VK_ACCESS_TRANSFER_WRITE_BIT,
+                        VK_ACCESS_TRANSFER_READ_BIT | VK_ACCESS_TRANSFER_WRITE_BIT,
                         VK_ACCESS_SHADER_READ_BIT,
                         VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
                         VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL,