target-alpha: Split up FPCR value into separate fields.
The fpcr_exc_status, fpcr_exc_mask, and fpcr_dyn_round fields are stored in <softfloat.h> format for convenience during regular execution. Revert the addition of float_exception_mask to float_status, added in ba0e276d. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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