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Summary: Allocate a single input buffer large enough to house each job, as well as enough space for the IO thread to write 2 extra buffers. One goes in the `POOL` queue, and one to fill, and then block on a full `POOL` queue. Since we can't overlap with the prefix, we allocate space for 3 extra input buffers. Test Plan: * CI * With and without ASAN/UBSAN run zstdmt with different number of threads on two large binaries, and verify that their checksums match. * Test on the tip of the zstdmt ldm integration. Reviewers: cyan Differential Revision: https://phabricator.intern.facebook.com/D7284007 Tasks: T25664120