tcg: add kick timer for single-threaded vCPU emulation
Currently we rely on the side effect of the main loop grabbing the iothread_mutex to give any long running basic block chains a kick to ensure the next vCPU is scheduled. As this code is being re-factored and rationalised we now do it explicitly here. Signed-off-by:Alex Bennée <alex.bennee@linaro.org> Reviewed-by:
Richard Henderson <rth@twiddle.net> Reviewed-by:
Pranith Kumar <bobby.prani@gmail.com>
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