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render/vulkan: use non-coherent memory for read_pixels()

Simon Ser requested to merge emersion/wlroots:vk-non-coherent-mem into master

The spec for VkMemoryPropertyFlagBits says:

device coherent accesses may be slower than equivalent accesses without device coherence [...] it is generally inadvisable to use device coherent or device uncached memory except when really needed

We don't really need coherent memory so let's not require it and invalidate the memory range after mapping instead.

Closes: #3868 (closed)

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