Solve several issues for new syntax

code_gen/cgen.py

graph/graphviz.py

ir/__init__.py

ir/arrays.py

ir/assign.py

ir/ast_node.py

ir/bin_op.py

ir/block.py

ir/branches.py

ir/cast.py

ir/data_types.py

ir/layouts.py

ir/lit.py

ir/loops.py

ir/math.py

ir/memory.py

ir/mutator.py

ir/operators.py

ir/properties.py

ir/select.py