Fix how AST nodes are identified uniquely

[JulianKemmerer]

Code has hash extensions added to it of the form

str_to_hash = str(
    c_ast_node
)  # Doesnt actually identify nodes!
if TEMP_HACKY_C_AST_NODE_ID:
    str_to_hash = str(id(c_ast_node))

where currently the hack of using python object id is used instead of being able to identify the node actually by its position in AST

makes hash codes change unnecessarily when C code has not changed