PR #10565: [GPU] Support broadcasts in cuDNN GEMM fusions.
PR #10565: [GPU] Support broadcasts in cuDNN GEMM fusions.

Imported from GitHub PR https://github.com/openxla/xla/pull/10565

Stacked PR.
Copybara import of the project:

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51eaaf6c8b722ef7c3273825d0585371cd55da26 by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Support broadcasts in cuDNN GEMM fusions.

Merging this change closes #10565

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10565 from openxla:cudnn_gemm_broadcasts 51eaaf6c8b722ef7c3273825d0585371cd55da26
