Peter Hawkins 3d4cb9f955 Enable MKL-DNN contraction kernels.
Add a new build option --enable_mkl_dnn that enables MKLDNN contraction kernels in XLA. This leads to significant performance improvements for XLA's dot operator. Enable MKL-DNN by default.

Update XLA version to include MKL-DNN build fix.

Also add a new --enable_march_native build option that turns on -march=native. This is unlikely to have a significant performance impact since XLA JIT-compiles most of its code. Leaving this off by default because it also generates code unlikely to run across a wide selection of architectures and so is unsuitable for building pip wheels.
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