[Re-submit] Make tracer be able to trace different forward functions
Summary: The root module may have different forward functions. The current implementation assumes only the func forward can be traced. In this PR, we add an attribute func name to Tracer class to enable users trace different functions
Test Plan:
python3 test/test_fx.py TestFX.test_trace_multiple_funcs
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/77502
Approved by: https://github.com/jamesr66a
