[lldb] [llvm] Add a createError variant without error code (NFC) (PR #93209)

[Adrian Prantl via llvm-commits]

adrian-prantl wrote:

The obvious downside is that it makes it easier to not even try to find a matching error code, but it looks like most incontrovertible errors are caught before the get reported as an exit status.

https://github.com/llvm/llvm-project/pull/93209