Peter Hawkins d481013f47 Add a CPU feature guard module to JAX.
To make sure that the CPU feature guard happens first, before any other code that may use instructions that do not exist, use a separate C extension module.

Fixes https://github.com/google/jax/issues/6671

PiperOrigin-RevId: 374683190
2021-05-19 10:58:35 -07:00
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