[dynamo] Optimize builtin handling (#122035)
Improves `benchmarks/dynamo/microbenchmarks/dynamo_microbenchmarks.py`
from 7.3s to 6.7s.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/122035
Approved by: https://github.com/Skylion007
ghstack dependencies: #122032, #122033, #122034
