JDK-8216424 removed the variable _total_visits, but left a use of it causing non-product builds to fail.

Fix:

diff --git a/src/hotspot/share/compiler/methodLiveness.cpp b/src/hotspot/share/compiler/methodLiveness.cpp
--- a/src/hotspot/share/compiler/methodLiveness.cpp
+++ b/src/hotspot/share/compiler/methodLiveness.cpp
@@ -340,7 +340,6 @@
 
   while ((block = work_list_get()) != NULL) {
     block->propagate(this);
- NOT_PRODUCT(_total_visits++;)
   }
 }