go/types, types2: substitute for type parameters in signatures when
comparing type identity
Generic signatures should be considered identical modulo type parameter
renaming. Update Identical to reflect this, by substituting type
parameters.
Fixes #49722
Change-Id: I33743768c72d8aa59c29bf72fcbabc5974f0b805
Reviewed-on: https://go-review.googlesource.com/c/go/+/366178
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>