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The Za64rs extension (reservation set -- a primitive memory unit of LR/SC atomic operations -- is naturally aligned and *at most* 64 bytes) is a superset of the Za128rs extension (*at most* 128 bytes; note that smaller the reservation set is, more fine grained control over atomics). This commit handles this as a feature implication.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.