[release-branch.go1.12] fmtsort: sort interfaces deterministically

Previously, the result of sorting a map[interface{}] containing
multiple concrete types was non-deterministic. To ensure consistent
results, sort first by type name, then by concrete value.

Fixes #30484

Change-Id: I10fd4b6a74eefbc87136853af6b2e689bc76ae9d
GitHub-Last-Rev: 1b07f0c275716e1b2834f74f9c67f897bae82882
GitHub-Pull-Request: golang/go#30406
Reviewed-on: https://go-review.googlesource.com/c/163745
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit 9d40fadb1c3245a318b155ee3e19a4de139401dc)
Reviewed-on: https://go-review.googlesource.com/c/go/+/164617
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed
tree: 7e56c66fbd51cb26b9727fca5226938594278439
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  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. VERSION
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
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  17. src/
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