v15.8: Blackwell support, latest TensorRT and MIGraphX libraries

TRT

• Upgraded to TensorRT 10.8.0, which adds support for Blackwell GPUs including RTX 50-series.
• The release archive is split into 2GB volumes (.7z.001, .7z.002).

MIGX

• Upgraded to MIGraphX 2.12.0 6acc1f9.

General

• Upgraded to CUDA 12.8.0 and HIP 6.2.4.

vsmlrt.py

• Added support for ArtCNN v1.2.0 models.
• Add tiling_optimization_level and l2_limit_for_tiling options to the TRT backend for memory-bandwidth-limited models (docs).

Full Changelog: v15.7...v15.8