[lldb] SBValue clone results in an incorrect type summary

In the lldb-dap test suite, I found an issue when I use `SBValue::Clone` where it seems the cloned value loses the type summary.

In this case its happening in https://github.com/llvm/llvm-project/blob/af15474262100ade9a8fcfd05f9e05c7ba23ff8c/lldb/test/API/tools/lldb-dap/variables/children/main.cpp#L18

```bash
$ lldb /Users/harjohn/Projects/lldb-build/lldb-test-build.noindex/tools/lldb-dap/variables/children/TestDAP_variables_children/a.out
(lldb) break set -n test_return_variable_with_children
(lldb) r
(lldb) thread step-out
(lldb) script
>>> rv = lldb.thread.return_value
>>> rv_clone = rv.Clone("(Return Value)")
>>> rv
(NonPrimitive) $0 = (buffer = "hello world!", x = 10, y = 20)
>>> rv_clone
(NonPrimitive) (Return Value) = (buffer = char[16] @ 0x00000008835a9ca0, x = 10, y = 20)
```

Start with lldb/test/API/tools/lldb-dap/variables/children/main.cpp at the reported return-value example, then reproduce the LLDB commands using SBValue::Clone. Compare the original value and its clone, and verify that the clone retains the original type summary instead of displaying the raw char array representation.

Written by the indexing model from the issue text.