[PATCH] ADT: Add SmallPtrSet::reset()

[Duncan P. N. Exon Smith]

0001 adds `SmallPtrSet::reset()`, which returns `SmallPtrSet` to small
mode after completely freeing its heap memory.  To facilitate testing,
I changed `isSmall()` to a public accessor.

Thoughts?

(0002 is the reason I was looking at this.)


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