PR #10730: [GPU] Reorganize compilation of cuDNN fusions.
PR #10730: [GPU] Reorganize compilation of cuDNN fusions.

Imported from GitHub PR https://github.com/openxla/xla/pull/10730

As discussed recently this moves compiled cuDNN graphs from HLO attributes to a separate structure passed to GPU executable.

cuDNN backend is now explicitly disabled in deviceless compilation mode - in the GEMM fusion autotuner pass and in the GPU compiler.
Copybara import of the project:

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e25ae7343bf08a88b0e917a10267d644dabde2d3 by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Reorganize compilation of cuDNN fusions.

Merging this change closes #10730

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10730 from openxla:cudnn_fusion_reorganize_compilation e25ae7343bf08a88b0e917a10267d644dabde2d3
