Data formatters cleanup:
- Making an error message more consistent
- Ensuring the element size is not zero before using it in a modulus
- Properly using target settings to cap the std::list element count
- Removing spurious element size calculations that were unused
- Removing spurious capping in std::map


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@178057 91177308-0d34-0410-b5e6-96231b3b80d8