fix unification bug.

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@569 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/tracer.c

@@ -112,13 +112,14 @@ low_level_trace(yap_low_level_port port, PredEntry *pred, CELL *args)
   /*  extern int gc_calls; */
 
   vsc_count++;
-  if (vsc_count == 32) {
+  /*  if (vsc_count < 123808900) return; */
+  if (vsc_count == 134) {
     printf("Here I go\n");
   }
   /* if (vsc_count > 500000) exit(0); */
   /* if (gc_calls < 1) return;*/
 #if defined(__GNUC__)
-  YP_fprintf(YP_stderr,"%llu, %p ", vsc_count, H);
+  YP_fprintf(YP_stderr,"%llu, %p %p %x ", vsc_count, H, TR, *(CELL *)0x91ca260);
 #endif
   /* check_trail_consistency(); */
   if (pred == NULL) {