open static fun getIntLiteral(numberToken: String, pos: Int, radix: Int): Literal
Process the string form of a number, using the specified base if supplied and return an appropriate literal to hold it. Any suffix to indicate a long will be taken into account (either 'l' or 'L' is supported).
numberToken - the token holding the number as its payload (eg. 1234 or 0xCAFE)
Return
a subtype of Literal that can represent it