private static boolean isDefaultName(Symbol symbol) {
		return symbol.getSource() == SourceType.DEFAULT;
	}
Compares two thunk functions from different programs to determine if they are 
equivalent to each other (effectively the same thunk function in the other program).
@param thunkFunction1 the first thunk function
@param thunkFunction2 the second thunk function
@return true if the functions are equivalent thunk functions.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ProgramDiff.java