pruneSparkQueue: check for tagged pointers This was a bug in 6.12.3.  I think the problem no longer occurs due to the way sparks are treated as weak pointers, but it doesn't hurt to test for tagged pointers anyway: better to do the test than have a subtle invariant.
pruneSparkQueue: check for tagged pointers
This was a bug in 6.12.3.  I think the problem no longer occurs due to
the way sparks are treated as weak pointers, but it doesn't hurt to
test for tagged pointers anyway: better to do the test than have a
subtle invariant.

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