Descriptor prefetches may be generated for instructions in control flow.
This means we cannot simply emit prefetches at the end of the preamble
because that may not be dominated by all their sources. This commit uses
the helpers introduced by e7ac1094f6 ("ir3: rematerialize preamble defs
in block dominated by sources") to find the correct block to insert
prefetches.
Fixes NIR validation errors in Dying Light 2.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Fixes: 4e2a0a5ad0 ("ir3: Add descriptor prefetching optimization on a7xx")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36885>
(cherry picked from commit 24cdb0b636)
10bf8e0ba6