[clang] set templates as invalid when any of the parameters are invalid

See PR51872 for the original repro.

This fixes a crash when converting a templated constructor into a deduction
guide, in case any of the template parameters were invalid.

Signed-off-by: Matheus Izvekov <mizvekov@gmail.com>

Reviewed By: rsmith

Differential Revision: https://reviews.llvm.org/D110460