In particular, if we have an index or bindless handle we were passing
the original handle which, technically, is uniform within the context of
the if. However, we can save the back-end compiler some effort if we
pass it the result of the read_first_invocation().
(Rebased by Kenneth Graunke and Rhys Perry.)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7592>
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