…to handle template argument values that are pointers one-past-the-end
of a non-array symbol. Also improves error messages in other template
argument scenarios where clang bails.
https://github.com/llvm/llvm-project/issues/97756
I don't think I hooked up the unit test right. I'm not sure one is
really needed for what boils down to a tweaked if statement. Please
advise.
