private void invalidateFunctions() {
		FunctionManagerDB functionManager = program.getFunctionManager();
		functionManager.functionTagsChanged();
	}
Tells the function manager that its tags are out of date. This
will cause functions to go to the database to retrieve tags next time they
are requested, rather than using their internal cache.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionTagManagerDB.java