The CoreEngine only gives us a ReturnStmt if the last element in the
CFGBlock is a CFGStmt, otherwise the ReturnStmt is nullptr.
This patch adds support for the case when the last element is a
CFGAutomaticObjDtor, by returning its TriggerStmt as a ReturnStmt.
Differential Revision: https://reviews.llvm.org/D49811
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@338777 91177308-0d34-0410-b5e6-96231b3b80d8
Reka Kovacs