Add support for performance counters when using the simulator.
v2 (Iago):
- Remove brackets from single-line conditionals
- Rename channel to channels
- Ensure perfmon start/stop function is implemented in all versions
- Use an array for perfmons instead of hash table
- Implement performance counters in CSD
v3 (Iago):
- Rename PERFMON_CHUNKS to PERFMONS_ALLOC_SIZE.
- Merge increasing lastid and ensuring space in a single function.
v4 (Iago):
- Assert perfid <= perfmons_size.
v7 (Iago):
- Do not stop perfmon on each submission
v8 (Iago):
- Add comment about stopping the perfmon when retrieving values.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10666>
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