Fix a crash in cppcoreguidelines-pro-type-member-init when checking a type...

Fix a crash in cppcoreguidelines-pro-type-member-init when checking a type with a template parameter as a base class.

Summary: Fixed a crash in cppcoreguidelines-pro-type-member-init when encountering a type that uses one of its template parameters as a base when compiling for C++98.

Patch by Michael Miller!

Reviewers: aaron.ballman, alexfh, hokein

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D19539

llvm-svn: 267700