target/arm/cpu64: introduce ARM_V8_FP16 feature bit
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-id: 20180227143852.11175-3-alex.bennee@linaro.org [PMM: postpone actually enabling feature until end of the patch series] Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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