PR #11912: [GPU] Support pointwise floor and ceil in GEMM fusions.
PR #11912: [GPU] Support pointwise floor and ceil in GEMM fusions.

Imported from GitHub PR https://github.com/openxla/xla/pull/11912

For this to work with Triton openxla/triton will need to include https://github.com/openai/triton/commit/62706e8c518c8c56e56460a43732d8e375217860.
Copybara import of the project:

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37efe4abc9caae6033ac1aabcf1799f2f3c1b0c2 by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Triton: support elementwise floor and ceil.

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7a21cb770cdb08bdb4504fb23c4dc1d31126c01f by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] cuDNN fusions: support elementwise floor and ceil.

Merging this change closes #11912

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/11912 from openxla:pointwise_floor_ceil 7a21cb770cdb08bdb4504fb23c4dc1d31126c01f
