public String getUseropName(int opNo) {
		if (opNo < language.getNumberOfUserDefinedOpNames()) {
			return language.getUserDefinedOpName(opNo);
		}
		return useropNames.get(opNo);
	}
For display purposes, get the header above the frame, usually the class name

@return the frame's display header
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/exec/PcodeProgram.java