Add a record scope around autograd::engine::evaluate_function (#63619)

Add a record scope around autograd::engine::evaluate_function (#63619)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63619

Adds a RECORD_FUNCTION with the function that is being valuate as part
of backwards execution. This has been useful in picking up some operations
in the backwards pass that otherwise would not show up, for example custom cpp
functions that use custom C++ code.
ghstack-source-id: 137041723

Test Plan:
CI

benchmark:
buck run mode/opt //scripts/rvarm1/ddp:bench

Reviewed By: albanD

Differential Revision: D30439492

fbshipit-source-id: 955917770cdf2a2edb0303223ace710b668ba388