[analyzer] Add a CXXDestructorCall CallEvent.

[analyzer] Add a CXXDestructorCall CallEvent.

While this work is still fairly tentative (destructors are still left out of
the CFG by default), we now handle destructors in the same way as any other
calls, instead of just automatically trying to inline them.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160020 91177308-0d34-0410-b5e6-96231b3b80d8