Contribution of PowerPC port.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 81361f02aae4023a3aa5d7b202ed89fd73828e7f..a694f980122988c82172344d17fca71020488843 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -67,6 +67,18 @@ class VerifyMarkingVisitor: public ObjectVisitor {
     }
   }
 
+  void VisitConstantPoolEmbeddedPointer(
+      Object** p,
+      ConstantPoolArray::WeakObjectState state) {
+    bool is_weak_object =
+        (state == ConstantPoolArray::WEAK_OBJECTS_IN_OPTIMIZED_CODE &&
+         Code::IsWeakObjectInOptimizedCode(*p)) ||
+        (state == ConstantPoolArray::WEAK_OBJECTS_IN_IC &&
+         Code::IsWeakObjectInIC(*p));
+    if (!is_weak_object)
+      VisitPointer(p);
+  }
+
   void VisitEmbeddedPointer(RelocInfo* rinfo) {
     ASSERT(rinfo->rmode() == RelocInfo::EMBEDDED_OBJECT);
     if (!rinfo->host()->IsWeakObject(rinfo->target_object())) {