New "typedefs" tests in DeclPrinter unitest

Clang Frontend
1

Hi all,

I’ve added 4 unittests to the DeclPrinter unittests, they check that
typedefs of simple, pointer, template, and nested types are printed
correctly.

Please, accept my changes: http://llvm-reviews.chandlerc.com/D2927

Regards,

Konrad