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

[Andrew Ng via cfe-commits]

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+from pathlib import Path
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nga888 wrote:

Thanks for the review. I will move `dtlto-helper.py` into `Inputs` subdirectory.

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