Enables the use of advanced barriers that combine the use of the VK_KHR_separate_depth_stencil_layouts
and VK_KHR_synchronization2 to reduce the reliance on layout tracking (except for defragging).
This is necessary in order to support parallel command buffer generation.
0: Do not enable support for sync2 barriers.
1: Enable sync2 barriers (default)
Usage
r.Vulkan.AllowSynchronization2 [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
