Fix PR19172 - wrong this adjustment calculated for virtual destructor in a class with complex inheritance

Reviewed at http://llvm-reviews.chandlerc.com/D3128

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204394 91177308-0d34-0410-b5e6-96231b3b80d8
Consumed Analysis: IgnoreParens bugfix.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204395 91177308-0d34-0410-b5e6-96231b3b80d8