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

[Jinjie Huang via llvm-commits]

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Jinjie-Huang wrote:

Got it, thanks for the explanation! It is indeed highly unlikely for "(anonymous namespace)" to already exist in the main .debug_str, but this change still makes sense since it avoids appending a duplicate synthesized name in that rare case. Thanks!

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