public int getMetadataNegativeSizeInWords() {
		return metadataNegativeSizeInWords;
	}
If this descriptor does not have a resilient superclass, this is the negative size of 
metadata objects of this class (in words). If this descriptor has a resilient superclass, 
this is a reference to a cache holding the metadata's extents.

@return The negative size of metadata objects of this class (in words) or a reference to a 
  cache holding the metadata's extents
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/swift/types/TargetClassDescriptor.java