pahole reports the following C2 IR nodes are optimizeable with rearranging fields:

```
class ArrayPointer {
        const bool _is_valid; /* 0 1 */
        /* XXX 7 bytes hole, try to pack */
        const class Node * _pointer; /* 8 8 */
        const class Node * _base; /* 16 8 */
        const jlong _constant_offset; /* 24 8 */
        const class Node * _int_offset; /* 32 8 */
        const jint _int_offset_shift; /* 40 4 */
        /* XXX 4 bytes hole, try to pack */
        const class GrowableArray<Node*> * _other_offsets; /* 48 8 */

        /* size: 56, cachelines: 1, members: 7 */
        /* sum members: 45, holes: 2, sum holes: 11 */
        /* last cacheline: 56 bytes */
};
```

```
class CallJavaNode : public CallNode {
        /* class CallNode <ancestor>; */ /* 0 128 */
        bool _optimized_virtual; /* 128 1 */
        bool _method_handle_invoke; /* 129 1 */
        bool _override_symbolic_info; /* 130 1 */
        /* XXX 5 bytes hole, try to pack */
        class ciMethod * _method; /* 136 8 */
        bool _arg_escape; /* 144 1 */

        /* size: 152, cachelines: 3, members: 6 */
        /* sum members: 12, holes: 1, sum holes: 5 */
        /* padding: 7 */
        /* last cacheline: 24 bytes */
};
```

```
class VectorSet : public AnyObj {
        /* class AnyObj <ancestor>; */ /* 0 0 */
        /* XXX last struct has 1 byte of padding */
        static const uint word_bits = 5; /* 0 0 */
        static const uint bit_mask = 31; /* 0 0 */
        uint _size; /* 0 4 */
        /* XXX 4 bytes hole, try to pack */
        uint32_t * _data; /* 8 8 */
        uint _data_size; /* 16 4 */
        /* XXX 4 bytes hole, try to pack */
        class Arena * _set_arena; /* 24 8 */
        /* size: 32, cachelines: 1, members: 5, static members: 2 */
        /* sum members: 24, holes: 2, sum holes: 8 */
        /* paddings: 1, sum paddings: 1 */
        /* last cacheline: 32 bytes */
};
```

```
class C2Access : public StackObj {
        /* class StackObj <ancestor>; */ /* 0 0 */
        /* XXX last struct has 1 byte of padding */
        int ()(void) * * _vptr.C2Access; /* 0 8 */
        DecoratorSet _decorators; /* 8 8 */
        enum BasicType _type; /* 16 1 */
        /* XXX 7 bytes hole, try to pack */
        class Node * _base; /* 24 8 */
        class C2AccessValuePtr & _addr; /* 32 8 */
        class Node * _raw_access; /* 40 8 */
        uint8_t _barrier_data; /* 48 1 */

        /* size: 56, cachelines: 1, members: 8 */
        /* sum members: 42, holes: 1, sum holes: 7 */
        /* padding: 7 */
        /* paddings: 1, sum paddings: 1 */
        /* last cacheline: 56 bytes */
};
```