## Summary
`ApplyPassToFunction` is a general-purpose wrapper that runs a pass on
only the functions in an IRModule whose name matches a regex. Its sole
in-tree production callers are `DecomposeOpsForInference` /
`DecomposeOpsForTraining` in `src/relax/transform/decompose_ops.cc`, and
both callers always supply a literal function name (never a regex
pattern). Inlining the logic as a file-local helper simplifies the
module-level context and removes an abstraction that exists only to
support one use case.
- Inline the helper as `ApplyDecomposeToFunction` (exact-name match, not
regex) in `src/relax/transform/decompose_ops.cc`
- Delete `src/ir/apply_pass_to_function.cc`, its `transform.h`
declaration, and the Python wrapper in `python/tvm/ir/transform.py`
- Remove two DCE tests
(`test_compatibility_with_apply_pass_to_function`,
`test_well_formed_output_with_restricted_scope`) that tested the
utility's plumbing rather than DCE behavior
Tianqi Chen
3918e14389