go/types, types2: factor out maximum type computation For untyped constant binary operations we need to determine the "maximum" (untyped) type which includes both constant types. Factor out this functionality. Change-Id: If42bd793d38423322885a3063a4321bd56443b36 Reviewed-on: https://go-review.googlesource.com/c/go/+/492619 Reviewed-by: Robert Griesemer <gri@google.com> Auto-Submit: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> Run-TryBot: Robert Griesemer <gri@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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