* loader: emulate immediate SSE4a instructions on macOS
* tests: simplify macOS SSE4a test integration
Keep the Darwin target, CTest registration, and aggregate dependency in
one conditional block without a separate target list. Preserve the
standalone target when BUILD_TESTING is disabled.
Lowercase the test filename and diagnostic prefix, and drop unrelated
formatting changes from the instruction emulator.
Credit Brandon Strong's related SSE4a work in
https://github.com/KytyPS5/KytyPS5/pull/467.
Co-authored-by: Brandon Strong <brandostrong@gmail.com>
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Co-authored-by: nmzik <Nmzik@mail.ru>
Co-authored-by: Brandon Strong <brandostrong@gmail.com>