…guard (#135503)"

This reverts commit 8df01c8.

Revert "[Dynamo] Remove ignored modes workaround (#135502)"

This reverts commit 860838e.

Revert "[Dynamo] Trace enter/exit of TorchFunctionModes (#135422)"

This reverts commit 7743149.

This passes this test

```
import torch
from torch.nn.attention.flex_attention import BlockMask, _mask_mod_signature, _score_mod_signature, flex_attention
from torch._inductor.lowering import make_pointwise, register_lowering
from torch._inductor.virtualized import ops
from torch.nn.attention.flex_attention import create_block_mask

torch.set_default_device('cuda')

flex_attention = torch.compile(flex_attention, dynamic=False)

prefix_lengths = torch.arange(8)
def prefix_lm(b, h, q, kv):
    return prefix_lengths[b] >= kv

mask = create_block_mask(prefix_lm, 8, None, 512, 512, _compile=True)
```

ghstack-source-id: 079b725
Pull Request resolved: #136590

…)" (pytorch#136590)

This reverts commit 7743149.

Reverts
* pytorch#135503
* pytorch#135502
* pytorch#135422

This passes this test. Earlier, the getitem would stay like a getitem in the Fx graph. But now the fake tensor propagations fails saying that .item is called. It seems that torch function is not getting triggered while fake tensor propagation.

```
import torch
from torch.nn.attention.flex_attention import BlockMask, _mask_mod_signature, _score_mod_signature, flex_attention
from torch._inductor.lowering import make_pointwise, register_lowering
from torch._inductor.virtualized import ops
from torch.nn.attention.flex_attention import create_block_mask

torch.set_default_device('cuda')

flex_attention = torch.compile(flex_attention, dynamic=False)

prefix_lengths = torch.arange(8)
def prefix_lm(b, h, q, kv):
    return prefix_lengths[b] >= kv

mask = create_block_mask(prefix_lm, 8, None, 512, 512, _compile=True)
```

Pull Request resolved: pytorch#136590
Approved by: https://github.com/Chillee

Summary:
This reverts commit 7743149b2be4a9eba7e0997ccdc6abe552bec266.

Reverts
* pytorch/pytorch#135503
* pytorch/pytorch#135502
* pytorch/pytorch#135422

This passes this test. Earlier, the getitem would stay like a getitem in the Fx graph. But now the fake tensor propagations fails saying that .item is called. It seems that torch function is not getting triggered while fake tensor propagation.

```
import torch
from torch.nn.attention.flex_attention import BlockMask, _mask_mod_signature, _score_mod_signature, flex_attention
from torch._inductor.lowering import make_pointwise, register_lowering
from torch._inductor.virtualized import ops
from torch.nn.attention.flex_attention import create_block_mask

torch.set_default_device('cuda')

flex_attention = torch.compile(flex_attention, dynamic=False)

prefix_lengths = torch.arange(8)
def prefix_lm(b, h, q, kv):
    return prefix_lengths[b] >= kv

mask = create_block_mask(prefix_lm, 8, None, 512, 512, _compile=True)
```

X-link: pytorch/pytorch#136590
Approved by: https://github.com/Chillee

Reviewed By: atalman

Differential Revision: D63431470

Pulled By: anijain2305

fbshipit-source-id: 60915b30336121b845af71f423582c22a6c65c3f