Revert "[LLDB] Do not dereference promise pointer in `coroutine_handle` pretty printer"

This reverts commit cd3091a8.

This change crashes on macOS systems in
formatters::StdlibCoroutineHandleSyntheticFrontEnd when
it fails to create the `ValueObjectSP promise` and calls
a method on it.  The failure causes a segfault while running
TestCoroutineHandle.py on the "LLDB Incremental" CI bot,
https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/

This change originally landed via https://reviews.llvm.org/D132815