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4a7b6abb19
Although the operation of these functions is defined in terms of f16 semantics, the input/output types are not f16, and they are generally available even when native `f16` support is not. But in at least one case, they are only available with `f16` support, so add a new downlevel flag that is cleared when these functions are not available. Add some infrastructure to simplify testing of missing capabilities/extensions, and add tests for a few more kinds of f16 usage. Co-authored-by: Erich Gubler <erichdongubler@gmail.com>