Micro-optimize singletonIterator
one more time.
#7181
Merged
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Micro-optimize
singletonIterator
one more time.I messed up the benchmarks, so there's a chance that cl/626542813 actually made things worse. The impact is probably still small, and it's hard to actually tell what will work better in practice. But this is largely an educational experience for me, so it continues....
RELNOTES=n/a