[release/2.9] [ROCm] derive the hipcub compatible cccl version from 'HIPCUB_CCCL_VERSION'

[jithunnair-amd]

Cherry-pick of pytorch#188072 (commit c8e2473) onto release/2.9.

Summary

• Introduce dependency on libhipcxx
• Guard FpLimits for c10::BFloat16 backport to pre CCCL 3.x
• Extend CUB_VERSION derivation for hipCUB using HIPCUB_CCCL_VERSION

Notes

This PR has merge conflicts that need to be resolved manually (conflict markers committed as requested).

Test plan

• Build with ROCm
• Verify hipCUB/CCCL compatibility glue compiles

Authored with assistance from Cursor

Made with Cursor

[rocm-repo-management-api]

Jenkins build for 2a44f965df853c1ed9baed7d74fb4ff358d4d7eb commit finished as FAILURE
Links: Pipeline Overview / Build artifacts / Test Results

Detected error during Pytorch building:

[7207/8156] Building CXX object caffe2/CMakeFiles/vec_test_all_types_AVX512.dir/__/aten/src/ATen/test/vec_test_all_types.cpp.o
[7208/8156] Linking CXX executable bin/vec_test_all_types_AVX512
[7209/8156] Building CXX object caffe2/CMakeFiles/torch_cpu.dir/__/aten/src/ATen/native/cpu/FlashAttentionKernel.cpp.AVX512.cpp.o
[7210/8156] Linking CXX shared library lib/libtorch_cpu.so
[7211/8156] Building HIPCC object caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/torch_hip_generated_cub-RadixSortPairs-int64-2.hip.o
FAILED: caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/torch_hip_generated_cub-RadixSortPairs-int64-2.hip.o /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/torch_hip_generated_cub-RadixSortPairs-int64-2.hip.o 
cd /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip && /opt/conda/envs/py_3.12/lib/python3.12/site-packages/cmake/data/bin/cmake -E make_directory /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/. && /opt/conda/envs/py_3.12/lib/python3.12/site-packages/cmake/data/bin/cmake -D verbose:BOOL=OFF -D build_configuration:STRING=RELEASE -D generated_file:STRING=/var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/./torch_hip_generated_cub-RadixSortPairs-int64-2.hip.o -P /var/lib/jenkins/pytorch/build/caffe2/CMakeFiles/torch_hip.dir/__/aten/src/ATen/hip/torch_hip_generated_cub-RadixSortPairs-int64-2.hip.o.cmake
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/hip/cub-RadixSortPairs-int64-2.hip:2:
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/hip/cub-RadixSortPairs.cuh:6:
In file included from /var/lib/jenkins/pytorch/aten/src/ATen/hip/cub.cuh:15:
/var/lib/jenkins/pytorch/aten/src/ATen/hip/cub_definitions.cuh:47:1: error: version control conflict marker in file