Removing superfluous IsSmi check from DescriptorArray::IsEmpty.

src/objects-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 1856 matching lines @@
   WRITE_FIELD(this, kHeaderSize + index * kPointerSize, heap->null_value());
 }
 
 
 Object** FixedArray::data_start() {
   return HeapObject::RawField(this, kHeaderSize);
 }
 
 
 bool DescriptorArray::IsEmpty() {
-  ASSERT(this->IsSmi() ||
-         this->MayContainTransitions() ||
+  ASSERT(length() >= kFirstIndex ||
          this == HEAP->empty_descriptor_array());
-  return this->IsSmi() || length() < kFirstIndex;
+  return length() < kFirstIndex;
 }
 
 
 bool DescriptorArray::MayContainTransitions() {
-  return length() >= kTransitionsIndex;
+  return !IsEmpty();
 }
 
 
 int DescriptorArray::bit_field3_storage() {
   Object* storage = READ_FIELD(this, kBitField3StorageOffset);
   return Smi::cast(storage)->value();
 }
 
 void DescriptorArray::set_bit_field3_storage(int value) {
   ASSERT(this->MayContainTransitions());
@@ skipping 3286 matching lines @@
 #undef WRITE_UINT32_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_