[llvm] [BOLT] Make .debug_names emission reproducible (PR #225218)

[Jinjie Huang via llvm-commits]

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Jinjie-Huang wrote:

Might be a tricky issue here. If a main CU comes in first and creates the entry, the `NeedsStrOffset` flag won't be set when a subsequent split CU is processed. Conversely, if a split CU comes in first, the flag gets set, this may still lead to a potential non-determinism issue?

https://github.com/llvm/llvm-project/pull/225218