[Clang] Correctly handle callees whose type is a Record type when classifying expressions (#68078)

when the callee is an object.

When implementing deducing this, we changed
`DeduceTemplateArgumentsFromCallArgument` to take an argument
classification because we need to deduce the type of argument for which
we might not have an expression yet.

However classifying a dependent call expression whose type is just some
sort of record or elaborated type was not supported.

Fixes #68024