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Only gc sparks locally when we can ensure marking is done.

Andreas Klebinger requested to merge wip/andreask/spark-gc into master

Fixes #22528 (closed)

We now only prune sparks in gc workers if work stealing is enabled as that implies a synchronization point after marking.

I think this should be fine.

  • Spark pruning is very cheap. So one needs to have a very large amount of them around for it being done in parallel to make a significant difference.
  • Programms using a lot of sparks likely want parallel gc. So we should get pruning in the workers in that case as well.
Edited by Andreas Klebinger

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