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Bohan Hou bb6f8aec55 [TIRx] Post-bringup follow-ups: op-dispatch, namespaces, launch bounds, gemm-async, backend reorg (#19757)
This PR batches several post-bringup TIRx follow-ups, rebased onto
current `main`.

### Changes
- **op-dispatch**: per-call exec scope via `Tx.<scope>.op`; remove
`ExecScopeStmt`
- **namespaces**: split TIRx op namespaces; remove tile-primitive kind
attrs
- **codegen**: support explicit CUDA launch bounds
- **gemm-async**: support contiguous-axis (K-major) operand slicing
- **backend reorg**: move in-tree GPU backends out of core into
`src/backend/<target>/` and `python/tvm/backend/<target>/`
(codegen/runtime/op), with the corresponding `CMakeLists.txt` /
`cmake/modules` and include-path updates

### Testing
- Builds with `USE_CUDA=ON` / `USE_LLVM=ON`
- The TIRx Python test suite (`tests/python/tirx/`) passes locally
2026-06-13 21:12:40 -04:00

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Python

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0.
"""Compatibility redirect for CUDA allocation pool helpers."""
from tvm.backend.cuda.lang.alloc_pool import * # noqa: F403 # pylint: disable=wildcard-import