PR #10344: [XLA:CPU] Enable BMM+Mul+Add fusion
PR #10344: [XLA:CPU] Enable BMM+Mul+Add fusion

Imported from GitHub PR https://github.com/openxla/xla/pull/10344

This PR enables the BatchMatMul + Mul + Add fusion and adds a simple test
Copybara import of the project:

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2a202c9d171064bb3005e0753af41e26f2e1baf3 by Kanvi Khanna <kanvi.khanna@intel.com>:

Enable BMM+Mul+Add fusion

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584e59861f5f91fae8222b9281e501dbeb270b94 by Kanvi Khanna <kanvi.khanna@intel.com>:

Address review comments

Merging this change closes #10344

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10344 from Intel-tensorflow:kanvi/bmm+mul+add 9c1fee304a6cfed55c0c869d1930641d942cf93f
