qom: Add cpu_exec_enter and cpu_exec_exit hooks
In preparation for removing a bunch of ifdefs from cpu_exec. Cc: Andreas Färber <afaerber@suse.de> Signed-off-by: NRichard Henderson <rth@twiddle.net> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Message-id: 1410626734-3804-2-git-send-email-rth@twiddle.net Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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