runtime, sync: add copyright headers to new files
For #38029 Change-Id: I71de2b66c1de617d32c46d4f2c1866f9ff1756ec Reviewed-on: https://go-review.googlesource.com/c/go/+/244631 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by:Dan Scales <danscales@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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