Fix the parser's updating of the template depth when parsing local templates and...

Fix the parser's updating of the template depth when parsing local templates and late-parsed templates. This is a slight tweak of r180708; It avoids incrementing depth when non-template local classes nested within member templates of local classes are encountered.
This patch was LGTM'd by Doug http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130506/079656.html and passed the regression tests that normally pass (i.e. excluding many Module and Index tests on Windows that fail regardless)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183618 91177308-0d34-0410-b5e6-96231b3b80d8