Ensure that any cycles spent when entering IRQ/NMI in interpreter are

accounted for in the TSC, and by extension the timer system.

src/386.c

@@ -214,10 +214,6 @@ void exec386(int cycs)
                                 }
                         }
                 }
-                ins_cycles -= cycles;
-                tsc += ins_cycles;
-                
-                cycdiff=oldcyc-cycles;
 
                 if (cpu_state.smi_pending)
                 {
@@ -291,6 +287,11 @@ void exec386(int cycs)
                 ins++;
                 insc++;
 
+                ins_cycles -= cycles;
+                tsc += ins_cycles;
+
+                cycdiff=oldcyc-cycles;
+
                 if (timetolive)
                 {
                         timetolive--;