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

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mmjjpp wrote:

They are related but not identical. N is the actual number of partitions produced by the final splitting process. LimitPartition is the upper bound supplied through the lto-split-partitions option.

If the call graph contains fewer independent partitions than LimitPartition, generating additional empty or redundant output files is unnecessary. Therefore, the final number of partitions may be smaller than the requested limit: N <= LimitPartition.

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