go/types, types: always record a type for inner composite literals

go/types, types: always record a type for inner composite literals

Ensure that inner composite literals get a (possibly invalid) type
if something goes wrong with the enclosing composite literal.

Fixes #69092.

Change-Id: Ib1d2d529c4683ea3ab1799a818b43538e152ae8e
Reviewed-on: https://go-review.googlesource.com/c/go/+/616616
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>