[RecursiveASTVisitor] fix skipping template specialization definition details

[greye via cfe-commits]

As described in [1] RecursiveASTVisitor skips definition of class
template specializations. This patch fixes it in the same way as is done
for partial specializations.

1. https://llvm.org/bugs/show_bug.cgi?id=12640
-------------- next part --------------
A non-text attachment was scrubbed...
Name: rec-ast-visitor-traverse-specializations.patch
Type: text/x-patch
Size: 1448 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20160229/78a1e353/attachment-0001.bin>