Follow-up to D77598: Simplify API by passing template parameters only when...

Follow-up to D77598: Simplify API by passing template parameters only when used/to imply "TemplOverloaded/overloadable"

These arguments were redundant, and other parts of D77598 did rely on
the presence/absence of template parameters to imply whether types
should be included for the argument (like
clang::printTemplateArgumentList) so do that here too.