Simplify isolates access during stack iteration (WAS: Move SafeStackFrameIterator::active_count_...)

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 3770bc3b35572a3b33e3cb7b82b5ad4d83276bb9..73bf2f260bcfa0014cf3fa1f9a80a778a61c5213 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -890,8 +890,8 @@ class CodeMarkingVisitor : public ThreadVisitor {
   explicit CodeMarkingVisitor(MarkCompactCollector* collector)
       : collector_(collector) {}
 
-  void VisitThread(ThreadLocalTop* top) {
-    for (StackFrameIterator it(top); !it.done(); it.Advance()) {
+  void VisitThread(Isolate* isolate, ThreadLocalTop* top) {
+    for (StackFrameIterator it(isolate, top); !it.done(); it.Advance()) {
       collector_->MarkObject(it.frame()->unchecked_code());
     }
   }