tree 6c28fd9f768fc478d797e6923a8325305cde3128
parent 0f37454c7238cfe95c5d6b427b2c400c084944aa
author Richard Smith <richard@metafoo.co.uk> 1585970263 -0700
committer Richard Smith <richard@metafoo.co.uk> 1585970448 -0700

Don't treat a CXXScopeSpec with a nested name specifier but no location
as invalid.

We create those when forming trivial type source information with no
associated location, which, unfortunately, we do create in some cases
(when a TreeTransform with no base location is used to transform a
QualType).

This would previously lead to rejects-valid bugs when we misinterpreted
these constructs as having no nested-name-specifier.