Remove experimental FDO support - #16198
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Signed-off-by: Rudi Grinberg <me@rgrinberg.com>
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Remove Dune's experimental integration with the external OCamlFDO tooling. The feature has no known users; in particular, the current OxCaml tree does not use Dune's
(fdo ...)workspace field or theOCAMLFDO_*build configuration. Keeping it also complicates compilation, linking, and foreign-code rules.This removes the workspace field, split compilation and linker-script pipeline, FDO-specific C/C++ flags and tool checks, together with its documentation and disabled tests.