Return unused point slice to pool in Call and VectorSelector eval. (#6427)
Return unused point slice to pool in Call and VectorSelector eval. (#6427)

Signed-off-by: Mark Nevill <94711d82d84d4926e038b8df5bff22d59f1bf22c@gmail.com>
prometheus/prometheus,keegancsmith/prometheus,kangwoo/prometheus,prometheus/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,kangwoo/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,kangwoo/prometheus,prometheus/prometheus,alileza/prometheus,keegancsmith/prometheus,Gouthamve/prometheus