Fix invariant so that we cannot record relocation slots for

src/mark-compact.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 286 matching lines @@
   enum SlotType {
     EMBEDDED_OBJECT_SLOT,
     RELOCATED_CODE_OBJECT,
     CODE_TARGET_SLOT,
     CODE_ENTRY_SLOT,
     DEBUG_TARGET_SLOT,
     JS_RETURN_SLOT,
     NUMBER_OF_SLOT_TYPES
   };
 
+  static const char* SlotTypeToString(SlotType type) {
+    switch (type) {
+      case EMBEDDED_OBJECT_SLOT:
+        return "EMBEDDED_OBJECT_SLOT";
+      case RELOCATED_CODE_OBJECT:
+        return "RELOCATED_CODE_OBJECT";
+      case CODE_TARGET_SLOT:
+        return "CODE_TARGET_SLOT";
+      case CODE_ENTRY_SLOT:
+        return "CODE_ENTRY_SLOT";
+      case DEBUG_TARGET_SLOT:
+        return "DEBUG_TARGET_SLOT";
+      case JS_RETURN_SLOT:
+        return "JS_RETURN_SLOT";
+      case NUMBER_OF_SLOT_TYPES:
+        return "NUMBER_OF_SLOT_TYPES";
+    }
+    return "UNKNOWN SlotType";
+  }
+
   void UpdateSlots(Heap* heap);
 
   void UpdateSlotsWithFilter(Heap* heap);
 
   SlotsBuffer* next() { return next_; }
 
   static int SizeOfChain(SlotsBuffer* buffer) {
     if (buffer == NULL) return 0;
     return static_cast<int>(buffer->idx_ +
                             (buffer->chain_length_ - 1) * kNumberOfElements);
@@ skipping 466 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_