[MINOR] Log out metadata size from transformencode

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/instructions/cp/MultiReturnParameterizedBuiltinCPInstruction.java

@@ -105,6 +105,10 @@ public void processInstruction(ExecutionContext ec) {
 		ec.releaseFrameInput(input1.getName());
 		ec.setMatrixOutput(getOutput(0).getName(), data);
 		ec.setFrameOutput(getOutput(1).getName(), meta);
+		
+		if(LOG.isDebugEnabled())
+			// debug the size of the output metadata.
+			LOG.debug("Memory size of metadata: " + meta.getInMemorySize());
 	}
 
 	@Override