Added the named tuple's error messages & workarounds when it returns from a function of a class in Pytorch Mobile.

To identify the error cases (returning NamedTuple type), I used the following coditions:
1) ins.op == RET  (for returing)
2) type->kind() == TypeKind::TupleType  (for pruning non-tuple types)
3) type->cast<TupleType>().name()  (for pruning Tuple type)
  - I could use the type's str (str() or repr_str()) directly, but I used whether it has the "name" attribute. Please give the comment for this.


[Information of Tuple and NamedTuple types]
1. Tuple
type->str(): (int, int)
type->repr_str(): Tuple[int, int]
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type()->cast<NamedType>()>name(): False    # different with NamedTuple

2. NamedTuple
type->str():  __torch__.myNamedTuple
type->repr_str(): __torch__.myNamedTuple
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type->cast<TupleType>().name() = True      # different with Tuple

(From the next diff, I will handle the other error cases: 1) returning List<module class>, Dict<module class> and 2) accessing Module class's member functions)

Differential Revision: [D24291962](https://our.internmc.facebook.com/intern/diff/D24291962/)

[ghstack-poisoned]

…lure"

Added the named tuple's error messages & workarounds when it returns from a function of a class in Pytorch Mobile.

To identify the error cases (returning NamedTuple type), I used the following coditions:
1) ins.op == RET  (for returing)
2) type->kind() == TypeKind::TupleType  (for pruning non-tuple types)
3) type->cast<TupleType>().name()  (for pruning Tuple type)
  - I could use the type's str (str() or repr_str()) directly, but I used whether it has the "name" attribute. Please give the comment for this.


[Information of Tuple and NamedTuple types]
1. Tuple
type->str(): (int, int)
type->repr_str(): Tuple[int, int]
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type()->cast<NamedType>()>name(): False    # different with NamedTuple

2. NamedTuple
type->str():  __torch__.myNamedTuple
type->repr_str(): __torch__.myNamedTuple
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type->cast<TupleType>().name() = True      # different with Tuple

(From the next diff, I will handle the other error cases: 1) returning List<module class>, Dict<module class> and 2) accessing Module class's member functions)

Differential Revision: [D24291962](https://our.internmc.facebook.com/intern/diff/D24291962/)

[ghstack-poisoned]

…lure"

Added the named tuple's error messages & workarounds when it returns from a function of a class in Pytorch Mobile.

To identify the error cases (returning NamedTuple type), I used the following coditions:
1) ins.op == RET  (for returing)
2) type->kind() == TypeKind::TupleType  (for pruning non-tuple types)
3) type->cast<TupleType>().name()  (for pruning Tuple type)
  - I could use the type's str (str() or repr_str()) directly, but I used whether it has the "name" attribute. Please give the comment for this.


[Information of Tuple and NamedTuple types]
1. Tuple
type->str(): (int, int)
type->repr_str(): Tuple[int, int]
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type()->cast<NamedType>()>name(): False    # different with NamedTuple

2. NamedTuple
type->str():  __torch__.myNamedTuple
type->repr_str(): __torch__.myNamedTuple
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type->cast<TupleType>().name() = True      # different with Tuple

(From the next diff, I will handle the other error cases: 1) returning List<module class>, Dict<module class> and 2) accessing Module class's member functions)

Differential Revision: [D24291962](https://our.internmc.facebook.com/intern/diff/D24291962/)

[ghstack-poisoned]

…lure"

Added the named tuple's error messages & workarounds when it returns from a function of a class in Pytorch Mobile.

To identify the error cases (returning NamedTuple type), I used the following coditions:
1) ins.op == RET  (for returing)
2) type->kind() == TypeKind::TupleType  (for pruning non-tuple types)
3) type->cast<TupleType>().name()  (for pruning Tuple type)
  - I could use the type's str (str() or repr_str()) directly, but I used whether it has the "name" attribute. Please give the comment for this.


[Information of Tuple and NamedTuple types]
1. Tuple
type->str(): (int, int)
type->repr_str(): Tuple[int, int]
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type()->cast<NamedType>()>name(): False    # different with NamedTuple

2. NamedTuple
type->str():  __torch__.myNamedTuple
type->repr_str(): __torch__.myNamedTuple
type->kind():  TypeKind::TupleType         # different with other types
type()->cast<NamedType>(): True
type->cast<TupleType>().name() = True      # different with Tuple

(From the next diff, I will handle the other error cases: 1) returning List<module class>, Dict<module class> and 2) accessing Module class's member functions)

Differential Revision: [D24291962](https://our.internmc.facebook.com/intern/diff/D24291962/)

[ghstack-poisoned]