Towards PR21289: don't lose track of unexpanded parameter packs with
non-dependent types, in CXXScalarValueInitExprs and in the
nested-name-specifier or template arguments of a DeclRefExpr in particular.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220028 91177308-0d34-0410-b5e6-96231b3b80d8