cmd/compile: cannot convert v (variable of type *Bar[T]) to type *Foo[T] [1.18 backport]

[gopherbot]

@findleyr requested issue #52529 to be considered for backport to the next 1.18 minor release.

@gopherbot, please open a backport issue for 1.18, this is a bug causing valid code not to compile.

[gopherbot]

Change https://go.dev/cl/403754 mentions this issue: [release-branch.go1.18] go/types,types2: delay the check for conflicting struct field names

[gopherbot]

Closed by merging f4f1999 to release-branch.go1.18.