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time: in Format give buffer an initial capacity
I have a small web server that simply sets several cookies along with an expires header, and then returns. In the cpuprofile for a 200k request benchmark, time.Time.Format() was showing up as 8.3% of cpu usage. Giving the buffer an inital capacity to avoid reallocs on append drops it down to 7.6%. R=golang-dev, r CC=golang-dev https://golang.org/cl/5992058
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