[lldb] When starting in a hidden frame, don't skip over hidden frames when navigating up/down (#166394)
When stopped in a hidden frame (either because we selected the hidden
frame or hit a breakpoint inside it), a user most likely is intersted in
exploring the immediate frames around it. But currently issuing
`up`/`down` commands will unconditionally skip over all hidden frames.
This patch makes it so `up`/`down` commands don't skip hidden frames if
the frame we started it was a hidden frame.