[clang] [llvm] [ThinLTO][Split] Split module for parallel compilation in backend (1/N) (PR #198702)

[Teresa Johnson via cfe-commits]

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teresajohnson wrote:

The tests for the LTO part should be llvm LTO tests (i.e. using llvm-lto2, under llvm/test/LTO and llvm/test/ThinLTO), and not clang in this PR.

https://github.com/llvm/llvm-project/pull/198702