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

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mmjjpp wrote:

 I have simplified this by merging the two options into one.

Now, option lto-split-partitions has two settings: a value greater than 1 enables SplitModuleCG and the partition counts are split; otherwise, SplitModuleCG is disabled.

The updated implementation is available at https://github.com/mmjjpp/llvm-project/pull/17.

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