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intel/brw: ensure find_live_channel don't access arch register without sync

Lionel Landwerlin requested to merge llandwerlin/mesa:review/live-channels-access-fix into main

What does this MR do and why?

intel/brw: ensure find_live_channel don't access arch register without sync

Another architecture register that requires some care before reading.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 49ee3ae9e8b ("intel/compiler: Lower FIND_[LAST_]LIVE_CHANNEL in IR on Gfx8+")

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