trace: Add per-vCPU tracing states for events with the 'vcpu' property

Each vCPU gets a 'trace_dstate' bitmap to control the per-vCPU dynamic
tracing state of events with the 'vcpu' property.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/vl.c b/vl.c
index d3ec532..a455947 100644
--- a/vl.c
+++ b/vl.c
@@ -4598,6 +4598,7 @@
 
     os_setup_post();
 
+    trace_init_vcpu_events();
     main_loop();
     replay_disable_events();