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[staging]mesa and x11 updates #56022
Motivation for this change
LGTM! LLVM being bumped to version 7 will also be necessary when we start packaging Mesa 19.0, so ti's good to do it now.
With the AMDGPU driver, I noticed that any program that used Vulkan was crashing for mysterious reasons due to the LLVM version bump, but after looking into it, it turns out this is due to an old file in ~/.cache named radv_builtin_shaders64
If you simply delete this file, or the 32 bit equivalent on 32-bit OSes, everything goes back to working as normal.
I'm not sure where to document this bug but I figured if I mention it here it will hopefully help any AMDGPU users who run into this issue