public Address getNaddr() {
		return nextInstrAddr;
	}
Get address of instruction after current instruction.  This may return null if this context 
instance does not support use of {@code inst_next} or next address falls beyond end of
address space.
@return address of next instruction or null
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/SleighParserContext.java