Change EIGEN_ALTIVEC_ENABLE_MMA_DYNAMIC_DISPATCH and EIGEN_ALTIVEC_DISABLE_MMA flags to be like TensorFlow's...

Chip Kerchnerrequested to merge
ChipKerchner/eigen:altivec_flags into master

Change EIGEN_ALTIVEC_ENABLE_MMA_DYNAMIC_DISPATCH and EIGEN_ALTIVEC_DISABLE_MMA flags to be like a TensorFlow's flag (either 0 or 1 - rather than undefined or defined). This will allow TensorFlow to control this flag.

Update documentation of new Altivec MMA flags.

Edited by Chip Kerchner

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