All direct users of this field want an integral value.  Drop all
of the extra casting between uint64_t and float64.
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20180119045438.28582-6-richard.henderson@linaro.org
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>