Strengthen a few assertions and add zapping of allocated...

src/objects-inl.h

 // Copyright 2006-2008 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 1349 matching lines @@
                      WriteBarrierMode mode) {
   ASSERT(index >= 0 && index < this->length());
   int offset = kHeaderSize + index * kPointerSize;
   WRITE_FIELD(this, offset, value);
   CONDITIONAL_WRITE_BARRIER(this, offset, mode);
 }
 
 
 void FixedArray::fast_set(FixedArray* array, int index, Object* value) {
   ASSERT(index >= 0 && index < array->length());
+  ASSERT(!Heap::InNewSpace(value));
   WRITE_FIELD(array, kHeaderSize + index * kPointerSize, value);
 }
 
 
 void FixedArray::set_undefined(int index) {
   ASSERT(index >= 0 && index < this->length());
   ASSERT(!Heap::InNewSpace(Heap::undefined_value()));
   WRITE_FIELD(this, kHeaderSize + index * kPointerSize,
               Heap::undefined_value());
 }
@@ skipping 1655 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_