Enable --verify-heap in release mode

src/heap.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 1243 matching lines @@
 
   Address* store_buffer_top_address() {
     return reinterpret_cast<Address*>(&roots_[kStoreBufferTopRootIndex]);
   }
 
   // Get address of native contexts list for serialization support.
   Object** native_contexts_list_address() {
     return &native_contexts_list_;
   }
 
+#ifdef VERIFY_HEAP
+  // Verify the heap is in its normal state before or after a GC.
+  void Verify();
+#endif
+
 #ifdef DEBUG
   void Print();
   void PrintHandles();
 
-  // Verify the heap is in its normal state before or after a GC.
-  void Verify();
-
   void OldPointerSpaceCheckStoreBuffer();
   void MapSpaceCheckStoreBuffer();
   void LargeObjectSpaceCheckStoreBuffer();
 
   // Report heap statistics.
   void ReportHeapStatistics(const char* title);
   void ReportCodeStatistics(const char* title);
+#endif
+
+  // Zapping is needed for verify heap, and always done in debug builds.
+  static inline bool ShouldZapGarbage() {
+#ifdef DEBUG
+    return true;
+#else
+#ifdef VERIFY_HEAP
+    return FLAG_verify_heap;
+#else
+    return false;
+#endif
+#endif
+  }
 
   // Fill in bogus values in from space
   void ZapFromSpace();
-#endif
 
   // Print short heap statistics.
   void PrintShortHeapStatistics();
 
   // Makes a new symbol object
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this function does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* CreateSymbol(
       const char* str, int length, int hash);
@@ skipping 902 matching lines @@
  public:
   inline AlwaysAllocateScope();
   inline ~AlwaysAllocateScope();
 
  private:
   // Implicitly disable artificial allocation failures.
   DisallowAllocationFailure disallow_allocation_failure_;
 };
 
 
-#ifdef DEBUG
 // Visitor class to verify interior pointers in spaces that do not contain
 // or care about intergenerational references. All heap object pointers have to
 // point into the heap to a location that has a map pointer at its first word.
 // Caveat: Heap::Contains is an approximation because it can return true for
 // objects in a heap space but above the allocation pointer.
 class VerifyPointersVisitor: public ObjectVisitor {
  public:
   inline void VisitPointers(Object** start, Object** end);
 };
-#endif
 
 
 // Space iterator for iterating over all spaces of the heap.
 // Returns each space in turn, and null when it is done.
 class AllSpaces BASE_EMBEDDED {
  public:
   Space* next();
   AllSpaces() { counter_ = FIRST_SPACE; }
  private:
   int counter_;
@@ skipping 569 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_