[llvm] [sancov] Fix stack-depth tracking to use debug locations (PR #162428)

[Justin Stitt via llvm-commits]

JustinStitt wrote:

> CI appears to be broken? "cp" failed? O_o

Actual error seems to be:

```
  CMake Error at /home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/unittests/CMakeLists.txt:25 (message):
    The LLDBBreakpointTests are not allowed to link liblldb.
  Call Stack (most recent call first):
    /home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/unittests/Breakpoint/CMakeLists.txt:1 (add_lldb_unittest)
```

which then causes the `cp` failure when the build artifact isn't there to be copied.

https://github.com/llvm/llvm-project/pull/162428