Return x.alias() when transpose is an nop (#84674)
To fix bug in https://gist.github.com/SherlockNoMad/b8dfbc614d3e65707d1bc379a098196d
```
def f(x):
return x.t()
x = torch.randn(2, requires_grad=True)
y = f(x)
compiled_f = make_fx(f)(x)
y_compiled = compiled_f(x)
print(compiled_f)
print("y.requires_grad", y.requires_grad)
print("y_compiled.requires_grad", y_compiled.requires_grad)
# def forward(self, x_1):
# t_default = torch.ops.aten.t.default(x_1); x_1 = None
# detach_default = torch.ops.aten.detach.default(t_default); t_default = None
# return detach_default
# y.requires_grad True
# y_compiled.requires_grad False
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84674
Approved by: https://github.com/cpuhrsch
