go/types: NewMethodSet doesn't terminate for recursively embedded generics [1.18 backport]

[gopherbot]

@findleyr requested issue #52715 to be considered for backport to the next 1.18 minor release.

@gopherbot please backport to 1.18. This is an infinite recursion via valid usage of the go/types API.

[gopherbot]

Change https://go.dev/cl/405117 mentions this issue: [release-branch.go1.18] go/types, types2: use a type lookup by identity in method lookup

[heschi]

Unavoidable bug in functionality new in 1.18 seems like a reasonable cherrypick to me. Approved.

[gopherbot]

Closed by merging 020fc47 to release-branch.go1.18.