go/types, types2: factor out list substitution code (cleanup)
- Replace the various subst.XList methods with a generic function.
- Rename comparable function to comparableType to avoid shadowing
predeclared type comparable.
- Rename substFunc/Var to cloneFunc/Var which is more accurate.
Change-Id: I3243f2093e4c43a537766f47e3348402de517090
Reviewed-on: https://go-review.googlesource.com/c/go/+/587775 Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Robert Findley <rfindley@google.com>