[llvm] [DebugInfo] Add clang flag to enable function-level debug line attribution (PR #93985)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

> This patch introduces a new Clang flag, `-mllvm -emit-func-debug-line-table-offsets`

Nit: Technically that is not a Clang flag. A "Clang flag" would be a driver or cc1 option, not `-mllvm`.

https://github.com/llvm/llvm-project/pull/93985