These functions were defined as static members of TemplateSpecializationType.
Now they are moved to namespace level. Previously there were different
implementations for lists containing TemplateArgument and TemplateArgumentLoc,
now these implementations share the same code.

This change is a result of refactoring patch D40508. NFC.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@319178 91177308-0d34-0410-b5e6-96231b3b80d8