Fix Dynamo tests failing with "Failed running call_function <built-in function linalg_norm" (#120993)
When iterating the ord value through an array, we are sharing the same torchdynamo context. This makes dynamo treat the `ord` variable as dynamic shape, causing problems.
In the `vector_norm` decomposition, casting the int type ord to float will fix this problem.
Fixes https://github.com/pytorch/pytorch/issues/119795
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120993
Approved by: https://github.com/lezcano
