[llvm] [Dexter] Adapt to upcoming lldb stepping behavior (PR #108127)

[Stephen Tozer via llvm-commits]

https://github.com/SLTozer approved this pull request.

Looks like a sensible way to solve the problem, thanks for this! Just so I understand correctly, in cases where we set breakpoints but exclusively advance using `go()`, as with the ConditionalController, the change in LLDB's behaviour will have no effect - is that correct?

https://github.com/llvm/llvm-project/pull/108127