private Instruction getFallthrough(Instruction instr) {
		if (instr != null) {
			Instruction nextInstr = instr.getNext();
			if (nextInstr != null && nextInstr.getMinAddress().equals(instr.getFallThrough())) {
				return nextInstr;
			}
		}
		return null;
	}
Attempt to markup FReg access instruction with register reference.

@param instr
@return register name if identified, else null
Ghidra/Processors/PIC/src/main/java/ghidra/app/plugin/core/analysis/Pic12Analyzer.java