<rdar://problem/12552374> & <rdar://problem/13100674>
<rdar://problem/12552374> & <rdar://problem/13100674>

The vtable pointer field is not necessarily a pointer and hence cannot be used for validation



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@173947 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb