There are 5 bits of state that could be added, but to save
space within tbflags, add only a single enable bit.
Helpers will determine the rest of the state at runtime.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20190108223129.5570-4-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>