CPU_INTERRUPT_EXIT is not set anymore in env->interrupt_request since
revision 6728. Make sure the bit is cleared on VM load.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6756 c046a42c-6fe2-441c-8c8c-71466251a162