cmd/compile: add support for alternative comparable semantics Add the experimental compiler flag -altcomparable. If set, the compiler uses alternative comparable semantics: any ordinary (non-type parameter) interface implements the comparable constraint. This permits experimenting with this alternative semantics akin to what is proposed in #52509. For #52509. Change-Id: I64192eee6f2a550eeb50de011079f2f0b994cf94 Reviewed-on: https://go-review.googlesource.com/c/go/+/444636 Run-TryBot: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
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