radv: Implement helpers for shader part caching.
Currently, shader part caching logic is duplicated between VS prolog and
PS/TCS epilogs. This commit introduces a common abstraction to
deduplicate the code.
Additionally, there are a few design decisions that diverts from the
current implementation:
1. A simple mutex is used instead of reader-writer lock. Prolog/epilog
constructions are serialized, removing the need to free duplicate
objects in case of a race.
2. A CS-local cache is used to quickly lookup an entry without holding a
lock. This eliminates locking in over 99% of cases.
3. A set is used to reduce number of allocations.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26028>
2 files changed
