## Summary
The cross-IR `CalleeCollector` abstraction in
`include/tvm/ir/analysis.h`
had a single consumer (relax `DeadCodeElimination`) yet forced its
per-language visitors to live in separate `analysis/` files registered
via a runtime vtable. This PR folds both visitors (relax + tirx)
directly into `src/relax/transform/dead_code_elimination.cc` as
anonymous-namespace helpers and deletes the now-dead abstraction.
The indirection only paid off when multiple unrelated passes shared the
visitor; with one consumer, the cross-TU vtable adds compile cost and
spreads the implementation across three files. Inlining improves
locality without enlarging the consumer's complexity.
Tianqi Chen
729108cfc4