Some more instrumentation to narrow down Failure leaks.

src/heap-inl.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 114 matching lines @@
   if (IsOneByte(t, chars)) {
     return AllocateInternalSymbol<true>(t, chars, hash_field);
   }
   return AllocateInternalSymbol<false>(t, chars, hash_field);
 }
 
 
 MaybeObject* Heap::AllocateAsciiSymbol(Vector<const char> str,
                                        uint32_t hash_field) {
   if (str.length() > SeqOneByteString::kMaxLength) {
-    return Failure::OutOfMemoryException();
+    return Failure::OutOfMemoryException(0x2);
   }
   // Compute map and object size.
   Map* map = ascii_symbol_map();
   int size = SeqOneByteString::SizeFor(str.length());
 
   // Allocate string.
   Object* result;
   { MaybeObject* maybe_result = (size > Page::kMaxNonCodeHeapObjectSize)
                    ? lo_space_->AllocateRaw(size, NOT_EXECUTABLE)
                    : old_data_space_->AllocateRaw(size);
@@ skipping 13 matching lines @@
   memcpy(answer->address() + SeqOneByteString::kHeaderSize,
          str.start(), str.length());
 
   return answer;
 }
 
 
 MaybeObject* Heap::AllocateTwoByteSymbol(Vector<const uc16> str,
                                          uint32_t hash_field) {
   if (str.length() > SeqTwoByteString::kMaxLength) {
-    return Failure::OutOfMemoryException();
+    return Failure::OutOfMemoryException(0x3);
   }
   // Compute map and object size.
   Map* map = symbol_map();
   int size = SeqTwoByteString::SizeFor(str.length());
 
   // Allocate string.
   Object* result;
   { MaybeObject* maybe_result = (size > Page::kMaxNonCodeHeapObjectSize)
                    ? lo_space_->AllocateRaw(size, NOT_EXECUTABLE)
                    : old_data_space_->AllocateRaw(size);
@@ skipping 646 matching lines @@
 AssertNoAllocation::~AssertNoAllocation() { }
 DisableAssertNoAllocation::DisableAssertNoAllocation() { }
 DisableAssertNoAllocation::~DisableAssertNoAllocation() { }
 
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_