[Docs] [Document Request] Is there any specifications on the symbol ordering file?

[朱一帆 via Docs]

Dear LLVM developers,

I see `ld.lld` support `symbol-ordering-file` option to support custom symbol layout. Unfortunately, there seems to be no accompanied documents on this feature. I do not know what kind of format I should use to customize the layout.

P.S. I was to use my own runtime profiling tool is generate the function placement. The code is compiled with `-ffunction-sections` and I wanted to reorder the function symbols in the final binary output.

Best.

Yifan ZHU
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