Fix slot recording of code target patches.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 2704f51f0adf83ed3d90a1de4dcb14ce0e189c4a..f027677cd13f7122f8f498e14d0c64231c27a517 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -4079,6 +4079,20 @@ void MarkCompactCollector::RecordCodeEntrySlot(Address slot, Code* target) {
 }
 
 
+void MarkCompactCollector::RecordCodeTargetPatch(Address pc, Code* target) {
+  ASSERT(heap()->gc_state() == Heap::MARK_COMPACT);
+  if(is_compacting()) {
+    Code* host = heap()->isolate()->inner_pointer_to_code_cache()->
+        GcSafeFindCodeForInnerPointer(pc);
+    MarkBit mark_bit = Marking::MarkBitFrom(host);
+    if (Marking::IsBlack(mark_bit)) {
+      RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host);
+      RecordRelocSlot(&rinfo, target);
+    }
+  }
+}
+
+
 static inline SlotsBuffer::SlotType DecodeSlotType(
     SlotsBuffer::ObjectSlot slot) {
   return static_cast<SlotsBuffer::SlotType>(reinterpret_cast<intptr_t>(slot));