[clang] [lld] [llvm] [DTLTO][Clang][LLD] Fix DTLTO for multi-call LLVM driver toolchain (PR #162456)

[Ben Dunbobbin via llvm-commits]

https://github.com/bd1976bris approved this pull request.

Thanks. This isn't something we need for PlayStation at present but it's nice to see `llvm-driver` support.

https://github.com/llvm/llvm-project/pull/162456