Repository: pytorch
Issue: [export]
Labels: triaged,oncall: pt2,export-triaged

### 🐛 Describe the bug

`aten::channel_shuffle` is not a core aten op and has no decomposition.

Repro

```python
import torch

m = torch.nn.ChannelShuffle(2)
inp = torch.arange(1, 17, dtype=torch.float32).view(1, 4, 2, 2)

exp = torch.export.export(m, (inp,))
exp = exp.run_decompositions()
print(exp.graph_module.code)
```

outputs
```
def forward(self, arg0_1):
    channel_shuffle = torch.ops.aten.channel_shuffle.default(arg0_1, 2);  arg0_1 = None
    return (channel_shuffle,)
```

### Versions

Collecting environment information...

Address sizes:                      48 bits physical, 48 bits virtual
Byte Order:                         Little Endian
CPU(s):                             112
On-line CPU(s) list:                0-111
Vendor ID:                          AuthenticAMD
Model name:                         AMD EPYC 7B13
CPU family:                         25
Model:                              1
Thread(s) per core:                 2
Core(s) per socket:                 28
Socket(s):                          2
Stepping:                           0
BogoMIPS:                           6099.99
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid tsc_known_freq pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext invpcid_single ssbd ibrs ibpb stibp vmmcall fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 clzero xsaveerptr arat npt nrip_save umip vaes vpclmulqdq rdpid fsrm
Hypervisor vendor:                  KVM
Virtualization type:                full
L1d cache:                          1.8 MiB (56 instances)
L1i cache:                          1.8 MiB (56 instances)
L2 cache:                           28 MiB (56 instances)
L3 cache:                           448 MiB (14 instances)
NUMA node(s):                       2
NUMA node0 CPU(s):                  0-27,56-83
NUMA node1 CPU(s):                  28-55,84-111
Vulnerability Gather data sampling: Not affected
Vulnerability Itlb multihit:        Not affected
Vulnerability L1tf:                 Not affected
Vulnerability Mds:                  Not affected
Vulnerability Meltdown:             Not affected
Vulnerability Mmio stale data:      Not affected
Vulnerability Retbleed:             Not affected
Vulnerability Spec rstack overflow: Mitigation; Safe RET
Vulnerability Spec store bypass:    Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:           Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2:           Mitigation; Retpolines; IBPB conditional; IBRS_FW; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds:                Not affected
Vulnerability Tsx async abort:      Not affected

Versions of relevant libraries:
[pip3] numpy==1.26.4
[pip3] optree==0.12.1
[pip3] pytorch-lightning==2.4.0
[pip3] torch==2.4.0
[pip3] torch_xla2==0.0.1
[pip3] torchmetrics==1.4.1
[pip3] torchvision==0.19.0
[pip3] triton==3.0.0
[conda] numpy                     1.26.4                   pypi_0    pypi
[conda] optree                    0.12.1                   pypi_0    pypi
[conda] pytorch-lightning         2.4.0                    pypi_0    pypi
[conda] torch                     2.4.0                    pypi_0    pypi
[conda] torch-xla2                0.0.1                    pypi_0    pypi
[conda] torchmetrics              1.4.1                    pypi_0    pypi
[conda] torchvision               0.19.0                   pypi_0    pypi
[conda] triton                    3.0.0                    pypi_0    pypi

cc @ezyang @chauhang @penguinwu