[roll] Roll fuchsia [kernel] Begin implementation of SpscBuffer This CL introduces a new transactional, single-producer, single-consumer ring buffer implementation called the SpscBuffer. This CL contains mainly offset management code; specifically it: 1. Introduces the combined_offsets_, which stores the read and write pointer as a single 64-bit value. 2. Adds utility functions to split and re-combine the offsets. 3. Adds helper functions that advance either the read or write half of the combined pointer by a desired delta. This CL also adds functions to initialize the backing storage buffer, and establishes requirements around the buffer's size. Notably, this CL does not implement the read or write operations. Those will be implemented in a follow-up CL. Original-Bug: 404539312 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1235159 Original-Revision: 8e06e31b1ed63f6ca6e5ecc3f153a3c964a623ac GitOrigin-RevId: 0b56959099dbe961f6705f42aef46a144d7e2491 Change-Id: I76e11ffcfc0881b384bb3dce0e47244d3e2019f7
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