PR42205: DebugInfio: Do not attempt to emit debug info metadata for static...

PR42205: DebugInfio: Do not attempt to emit debug info metadata for static member variable template partial specializations

Would cause a crash in an attempt to create the type for the still
unresolved 'auto' in the partial specialization (& even without the use
of 'auto', the expression would be value dependent &
crash/assertion-fail there).

llvm-svn: 363606