[llvm] [DTLTO][LLVM] Integrated Distributed ThinLTO (DTLTO) (PR #127749)

[via llvm-commits]

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+Tests for DTLTO (integrated distributed ThinLTO) functionality.
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+These are integration tests as DTLTO invokes `clang` for code-generation.
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bd1976bris wrote:

This test checks that the DTLTO code that creates Clang command lines generates the expected options and that those options are accepted by clang. I wrote it to use llvm-lto and opt so it could be part of this commit before the clang and lld patches go in. However, I think it is a nice principle to only use external tools in cross-project-tests. I have removed the test from this PR with the intention of adding it back later. Additionally if we can use your idea (https://github.com/llvm/llvm-project/pull/127749#discussion_r1976039748) of storing the Clang `-c` step options and applying them to the remote backend compilations then this test will be rewritten to test that behavior instead.

https://github.com/llvm/llvm-project/pull/127749