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The thumbv6m target does not support atomics. Historically, LLVM had a bug where atomic load/stores for this target were emitted as plain load/stores rather than as libatomic calls. This was fixed in https://reviews.llvm.org/D120026, which will be part of LLVM 15. As we require that "atomic support" does not use libatomic, we need to indicate that this target does not have native atomics.
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.