[PyTorch] [Memory profiler] Early return if qualified name is invalid (#105495)
Summary: Return early if we can easily determine the operator qualified name is invalid before attempting to retrieve the schema. In particular "::" should always be present. Quick estimate shows that this is >50x faster (100 us -> 2 us).
Test Plan: CI
Differential Revision: D47562587
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105495
Approved by: https://github.com/aaronenyeshi
