Teach clang_getCursorSemanticParent() and

clang_getCursorLexicalParent() to cope with class and function
templates, along with the parent of the translation unit. Fixes PR8761
and PR8766.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122324 91177308-0d34-0410-b5e6-96231b3b80d8