Add a little extra test coverage for simple template names

This would fail with an overly naive approach to simple template
name (clang's -gsimple-template-names) since the names wouldn't be
unique per specialization, creating ambiguity/chance that a query for
one specialization would find another.

GitOrigin-RevId: 72d9390778966d4f87ec4b1de63c107b2fd46b9a
1 file changed