LLVM (like NIR) requires phi instructions to be before any other
instructions in the block. ac_branch_exited() can insert non-phi
instructions before visit_block() adds phis, so visit_block() should add
phi instructions before the non-phi instructions ac_branch_exited()
inserts.
Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Fixes: aa757f4f8c ("ac/llvm: fix demote inside conditional branches")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8054>
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