[llvm] [Dexter] Implement DexStepFunction and DexContinue (PR #152721)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

Thanks for the log. Looking at it, I have high confidence @SLTozer change https://github.com/llvm/llvm-project/pull/156481 will fix the bot.

Stephen explains it well and goes into more detail in his PR but essentially LLDB seems to be "caching" the stepIn request in some situations involving implicit (/not-user-set) breakpoints, overriding a subsequent continue command, resulting in stepping where we were expecting continue-to-breakpoint.

The logs show a request/response a pattern that matches that issue:

```
> stepOut
< "stopped" "step", at line 33
> stepIn (workaround to check if there are breakpoints  on line 33)
< "stopped" "breakpoint", at line 33
> continue
< "stopped" "step" // <--- would expect "stopped" "breakpoint" at next breakpoint instead
```



https://github.com/llvm/llvm-project/pull/152721