public AssemblyProduction getPureRecursion(AssemblyNonTerminal lhs) {
		return pureRecursive.get(lhs.getName());
	}
Obtain, if present, the purely recursive production having the given LHS

@param lhs the left-hand side
@return the desired production, or null
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/grammars/AssemblyGrammar.java