DebugInfo: Accurate location information for complex assignment

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223828 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Correct location for compound complex assignment

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223835 91177308-0d34-0410-b5e6-96231b3b80d8