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accel/tcg: Improve setting of can_do_io at start of TB
Initialize can_do_io to true if this the TB has CF_LAST_IO and will consist of a single instruction. This avoids a set to 0 followed immediately by a set to 1. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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