expvar: make (*Map).Init clear existing keys
fixes #21619 Change-Id: I5bb513dfc8cac875b06a262eec40b5863ae23a4c Reviewed-on: https://go-review.googlesource.com/62370Reviewed-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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