delete special fake tensor new handling (#86144)
Delete the special-cased handling of `new` in FakeTensor. Ever since the dispatch keys were updated to reflect the FakeTensor's device, the special cased handling was not needed.
Fixes https://github.com/pytorch/torchdynamo/issues/1448
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86144
Approved by: https://github.com/ezyang
