target/arm: Add DISAS_UPDATE_NOCHAIN

Add an option that writes back the PC, like DISAS_UPDATE_EXIT,
but does not exit back to the main loop.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200626033144.790098-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
3 files changed