[libclang] Add defensive checks to make sure we don't try to dereference
a null pointer after getCursorDecl() is called. rdar://10298421.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146312 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed