[analyzer] Don't crash when a path goes through a 'delete' destructor call.

This was just left unimplemnted from r191381; the fix is to report this call
location as the location of the 'delete' expr.

PR17746

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@193783 91177308-0d34-0410-b5e6-96231b3b80d8