radv: add RADV_DEBUG=invariantgeom

This can be used to work around a common class of bugs appearing as
flickering.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8104>

src/amd/vulkan/radv_debug.h

@@ -60,6 +60,7 @@ enum {
 	RADV_DEBUG_HANG              = 1u << 29,
 	RADV_DEBUG_IMG               = 1u << 30,
 	RADV_DEBUG_NO_UMR            = 1u << 31,
+	RADV_DEBUG_INVARIANT_GEOM    = 1ull << 32,
 };
 
 enum {