llvmpipe: include gallivm perf flags in shader cache.

Otherwise if you set perf flags, then don't set them,
they won't take affect.

Fixes: 6c0c61cb48e8 ("llvmpipe: add infrastructure for disk cache support")
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6630>
3 files changed