Revert "go/types, types2: track gotypesalias non-default behavior"
This reverts commit
c51f6c62576ab3088a981b9cef90e413ac99e333.
Reason for revert: This breaks toolchain bootstrapping in Google. Root cause investigation is pending.
Error message is:
```
<unknown line number>: internal compiler error: panic: godebug: Value of name not listed in godebugs.All: gotypesalias
```
Change-Id: Ie3dff566a29b3b0846ebc8fe0a371c656a043a4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/579575
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Lasse Folger <lassefolger@google.com>