radeonsi: use thread_context::bytes_mapped_limit

Limit the amount of "in-flight" mapping to 1/4 of the total RAM.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2735
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4508>
1 file changed