This was plain broken. The solution is to not require any framebuffer
changes. Silently skipping results in broken behavior. e.g:
(secondary cmdbuffer with no framebuffer)
ClearAttachment 2
translated into
bind attachment 2 as attachment 0 (skipped)
clear attachment 0
restore original bindings (skipped)
which results in clearing attachment 0, not what we wanted. It is
a small wonder CTS doesn't find it until VK_KHR_dynamic_rendering.
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13699>
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