@Override
	public PcodeUseropLibrary<T> getUseropLibrary() {
		if (library == null) {
			library = createUseropLibrary();
		}
		return library;
	}
Extension point: Behavior when a p-code userop definition is not found

@param op the op
@param opName the name of the p-code userop
@return true if handle, false if still undefined
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/DefaultPcodeThread.java