Robert David a0422e404e Remove empty Init, Free, and Prepare functions.
The interpreter doesn't call it if a nullptr is presented in the registration. This can slightly reduce code size.

PiperOrigin-RevId: 304284594
Change-Id: I7fa092aa9cf5142ee30982d07655971fd1626630
2020-04-01 16:26:04 -07:00
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