[llvm] [DebugInfo] Don't apply is_stmt on MBB branches that preserve lines (PR #108251)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

> [...do this to avoid] giving us repeated steps on the same line [...]

Is there an argument that it might be reasonable to leave this decision to the debugger?

https://github.com/llvm/llvm-project/pull/108251