replay: improve interrupt handling

This patch improves interrupt handling in record/replay mode.
Now "interrupt" event is saved only when cc->cpu_exec_interrupt returns true.
This patch also adds missing return to cpu_exec_interrupt function.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20170124071708.4572.64023.stgit@PASHA-ISP>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/cpu-exec.c b/cpu-exec.c
index 4188fed..fa08c73 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -508,8 +508,8 @@
            True when it is, and we should restart on a new TB,
            and via longjmp via cpu_loop_exit.  */
         else {
-            replay_interrupt();
             if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
+                replay_interrupt();
                 *last_tb = NULL;
             }
             /* The target hook may have updated the 'cpu->interrupt_request';