Lei Wang bc1aa2863b [SampleFDO] Support enabling sample loader pass in O0 mode (#113985) ...

Add support for enabling sample loader pass in O0 mode(under
`-fsample-profile-use`). This can help verify PGO raw profile count
quality or provide a more accurate performance proxy(predictor), as O0
mode has minimal or no compiler optimizations that might otherwise
impact profile count accuracy.
- Explicitly disable the sample loader inlining to ensure it only emits
sampling annotation.
- Use flattened profile for O0 mode.
- Add the pass after `AddDiscriminatorsPass` pass to work with
`-fdebug-info-for-profiling`.

2024-11-08 15:29:44 -08:00

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