[llvm] [DebugInfo] Don't set prologue_end behind line-zero call insts (PR #156850)

[Stephen Tozer via llvm-commits]

https://github.com/SLTozer commented:

In principle SGTM, some minor nits and otherwise suggest a brief wait to see if anyone else has comments.

https://github.com/llvm/llvm-project/pull/156850