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

[David Blaikie via llvm-commits]

dwblaikie wrote:

> Small ping for @dwblaikie - I'm preparing to revert the previous commit (some tests that were updated since it landed have to be updated), with the intent to reland the changes as part of this PR. Since I've not been able to reproduce the file size increases that you noted, are you able to test this patch to see if it reduces the impact of the previous patch?

Hrm :/ what did you try testing?

I'll see if I can find someone to investigate this on our side to get more data... 

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