[clang] [lld] [llvm] Integrated Distributed ThinLTO (DTLTO): Initial support (PR #126654)

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bd1976bris wrote:

> Hello! I had a quick glance at this and while I am no expert in the actual LTO internal code, I was totally able to understand how we could integrate this with our build system (fastbuild) so I am really happy you have decided to upstream this. I am planning of doing an internal prototype of this soon to understand how it would affect our applications.

Great. Actually, we wanted to add support for distributing via FASTBuild, icecream and distcc with the initial DTLTO PR. However, we investigated found that these couldn't be supported without extending the existing codebases. More details to follow..

https://github.com/llvm/llvm-project/pull/126654