icount: make it thread-safe
This lets threads other than the I/O thread use vm_clock even in -icount mode.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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This lets threads other than the I/O thread use vm_clock even in -icount mode.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>