Fix depth buffer reuse sync #345
   Merged  
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fix #308
Depth Attachment
VK_ATTACHMENT_STORE_OP_DONT_CAREhappens inVK_PIPELINE_STAGE_LATE_FRAGMENT_TESTS_BIT+VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT. Alter code to that effect with the assumption this was the intended previous resource access to synchronize against.