Diego Caballero d18653005c Add TTI pass initialization to pass managers.
Many LLVM transformations benefits from knowing the targets. This enables optimizations,
especially in a JIT context when the target is (generally) well-known.

Closes #49

COPYBARA_INTEGRATE_REVIEW=https://github.com/tensorflow/mlir/pull/49 from dcaballe:dcaballe/tti ab02f72eb326f660945696e5dadeeb983cf263b3
PiperOrigin-RevId: 261840617
2019-08-05 22:28:21 -07:00
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