anv: fix robust buffer access

anv: fix robust buffer access

In 957bbc6ad907ec we merged all the per stages allocations of push
constants into a single one. Unfortunately one field remained per
stage.

This fixes the issue by including all the per stage values of the
masked registers for robust buffer access into the push constant data.

v2: Drop unneeded loop (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 957bbc6ad907ec ("anv: simplify push constant emissions")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6505>