Comment parsing tests: move tests where they belong
Move C++-specific tests that were checking if we attach a base class comment to
a derived class to an existing test comment-to-html-xml-conversion.cpp. Note
that the original testing approach was not actually testing the class--comment
relationship. It only checked that we attached the comment *somewhere*.
The rest of subclass-comment.mm should be also moved elsewhere.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188658
91177308-0d34-0410-b5e6-
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