parser: Create the literal node type

Since we want to extend our code to support multiple kind of expression
it does not make sense that the return statement always return a number.

For now on, return statement has an ast_node_t as argument, meaning that
it could be anything. The literal_node_t was also implemented in order
to keep the application behavior.

Following the C's calling convention the literal values are stored at
%eax and the return takes this argument to do anything it is needed.

Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>

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