private void addMethodInfo(MethodInfo bm) {
		List<MethodInfo> methods =
			methodsByAddr.computeIfAbsent(bm.getAddress(), unused -> new ArrayList<>());
		methods.add(bm);
	}
Initializes golang function / method lookup info

@throws IOException if error reading data
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/golang/rtti/GoRttiMapper.java