LLVM implements multiple workarounds for gfx11.
The problem is that they're not applied for shaders built in
parts.
LLVM will be modified to be more conservative and apply the
workaround in more places but in the meantime, add a simpler
implementation in the NIR to LLVM backend: insert a wait at
the end of each shader part.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10785
Cc: mesa-stable
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29304>
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