- Fix CPU feature dependencies of GFNI, VAES, and VPCLMULQDQ

- Print the correct error code when FRED reports a bad event type

- Add a FRED-specific INT80 handler without the special dances that need
  to happen in the current one

- Enable the using-the-default-return-thunk-but-you-should-not warning
  only on configs which actually enable those special return thunks

- Check the proper feature flags when selecting BHI retpoline mitigation
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