[dev.regabi] go/constant: optimize BitLen
Avoids an unnecessary heap allocation when computing the bit length of int64 values. Change-Id: I69dfc510e461daf3e83b0b7b6c0707f6526a32d0 Reviewed-on: https://go-review.googlesource.com/c/go/+/272646 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Reviewed-by:Robert Griesemer <gri@golang.org>
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