[llvm] [DWARF] Emit a worst-case prologue_end flag for pathological inputs (PR #107849)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Same on Arm and AArch64 - https://lab.llvm.org/buildbot/#/builders/59/builds/8032.

We expect to be stopped at line 0 `artificial_location.c:0` but are instead at line 3 `artificial_location.c:3`. Which could be the intended change of this patch, not sure at a glance.

https://github.com/llvm/llvm-project/pull/107849