More java.util.Formatter performance work.
I got distracted into doing a bit more here, mainly speeding up the slow path
for integers. I've started to pull out some of the error checking too. We could
do a lot more along those lines, but then we'd fail even more jtreg tests which
assume a specific order in which checks are made. (I don't think we should
worry about that; I'm stopping here because this isn't what I wanted to do
today, not because I don't think we should press on. There's plenty of more
important stuff to look at first.)
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