PR #12041: [XLA:CPU][oneDNN] Gelu Exact patterns and tests
PR #12041: [XLA:CPU][oneDNN] Gelu Exact patterns and tests

Imported from GitHub PR https://github.com/openxla/xla/pull/12041

This PR adds support for Matmul fusion with Gelu-Exact pattern and tests.
Copybara import of the project:

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899b5619e7dc2edca4ea169f6fddf41e2a4a54e7 by Kanvi Khanna <kanvi.khanna@intel.com>:

Add Gelu-exact pattern and tests

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bb912bf4de8471883b1938c61aa5b58245cd5a6f by Kanvi Khanna <kanvi.khanna@intel.com>:

Address review comments

Merging this change closes #12041

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12041 from Intel-tensorflow:kanvi/gelu-erf bb912bf4de8471883b1938c61aa5b58245cd5a6f
