torch.from_numpy incorrect when dtype=int64 and certain numpy flags are set

```python
import scipy.misc
lena = scipy.misc.lena()
print(lena.shape)
print(lena[90,90])
print(lena.dtype)
```
(100, 212)
151
int64
```python
img = torch.from_numpy(lena)
print(img.size())
print(img[90,90])
```
torch.Size([100, 212])
-13846360384743979

```python
img = torch.from_numpy(lena.astype(float))
print(img.size())
print(img[90,90])
```
torch.Size([100, 212])
151.0
