Refactor how embedded pointers are visited.

src/incremental-marking.cc

Index: src/incremental-marking.cc
diff --git a/src/incremental-marking.cc b/src/incremental-marking.cc
index 60a21eed6a984efe65db86c08f890060a3e25119..88ebd783ea8369a0839e9c1e39207596aafa8972 100644
--- a/src/incremental-marking.cc
+++ b/src/incremental-marking.cc
@@ -117,14 +117,12 @@ class IncrementalMarkingMarkingVisitor : public ObjectVisitor {
         incremental_marking_(incremental_marking) {
   }
 
-  void VisitEmbeddedPointer(Code* host, Object** p) {
-    Object* obj = *p;
-    if (obj->NonFailureIsHeapObject()) {
-      heap_->mark_compact_collector()->RecordSlot(
-          reinterpret_cast<Object**>(host),
-          p,
-          obj);
-      MarkObject(obj);
+  void VisitEmbeddedPointer(RelocInfo* rinfo) {
+    ASSERT(rinfo->rmode() == RelocInfo::EMBEDDED_OBJECT);
+    Object* target = rinfo->target_object();
+    if (target->NonFailureIsHeapObject()) {
+      heap_->mark_compact_collector()->RecordRelocSlot(rinfo, target);
+      MarkObject(target);
     }
   }