protected AssemblyParseTreeNode getFiller() {
		return new AssemblyParseHiddenNode(resolver.grammar);
	}
Construct the hidden sub-table operand state generator

@param resolver the resolver
@param subtableSym
@param fromLeft the accumulated patterns from the left sibling or the parent
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/AssemblyHiddenConstructStateGenerator.java