[release-branch.go1.16] runtime: simplify histogram buckets considerably

There was an off-by-one error in the time histogram buckets calculation
that caused the linear sub-buckets distances to be off by 2x.

The fix was trivial, but in writing tests I realized there was a much
simpler way to express the calculation for the histogram buckets, and
took the opportunity to do that here. The new bucket calculation also
fixes the bug.

For #50732.
Fixes #50733.

Change-Id: Idae89986de1c415ee4e148f778e0e101ca003ade
Reviewed-on: https://go-review.googlesource.com/c/go/+/380094
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit 2e9dcb508647dc473a37ecfa244d2bc4a1843ab4)
Reviewed-on: https://go-review.googlesource.com/c/go/+/384620
3 files changed
tree: 63c78b67745dac93e614e922c728a7286c50409b
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  13. favicon.ico
  16. README.md
  17. robots.txt
  18. SECURITY.md

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