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## Summary I happened to notice that we box `TypeParams` on `StmtClassDef` but not on `StmtFunctionDef` and wondered why, since `StmtFunctionDef` is bigger and sets the size of `Stmt`. @charliermarsh found that at the time we started boxing type params on classes, classes were the largest statement type (see #6275), but that's no longer true. So boxing type-params also on functions reduces the overall size of `Stmt`. ## Test Plan The `<=` size tests are a bit irritating (since their failure doesn't tell you the actual size), but I manually confirmed that the size is actually 120 now.