fmt: fix panic with large precision
The code already handled high widths but not high precisions. Also make sure it handles the harder cases of %U. Fixes #10745. Change-Id: Ib4d394d49a9941eeeaff866dc59d80483e312a98 Reviewed-on: https://go-review.googlesource.com/9769Reviewed-by:Ian Lance Taylor <iant@golang.org>
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