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Follow up commit for the issue 39827
- updates documentation on volatile memory intrinsics, now the case of zero-sized types is mentioned explicitly. Volatile memory operations which doesn't affect memory at all are omitted in LLVM backend, e.g. if number of elements is zero or type used in generic specialisation is zero-sized, then LLVM intrinsic or related code is not generated. This was not explicitly documented before in Rust documentation and potentially could cause issues.
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