Constructor types declared in the program hold class values as
checked-dynamic values since #1725. A fetched provenance source counts as
a program file, so the unused `@__PURE__` const typed `{ new (): any }` in
the provenance fixture now had a mapping, no longer elided, and its
initializer refused (SC1090). Fetched sources keep their constructor types
unmapped, as before #1725.
Chris Tate
ed5f54c936