flag: use strconv instead of fmt in values' String funcs
The existing implementation of flag values with fmt package uses more memory and works slower than the implementation with strconv package. Change-Id: I9e749179f66d5c50cafe98186641bcdbc546d2db Reviewed-on: https://go-review.googlesource.com/28914Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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