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Strengthen C++20 SC accesses
`@SabrinaJewson` noted in rust-lang#2301 that Miri could produce behaviours forbidden under C++20 even without SC fences. Due to the added coherence-ordered before relationship which is created from read from and read before, plus the fact that coherence-ordered before between SC operations must be consistent with the Global Total Order S, in C++20 if there's an SC load that reads from any store, then a later SC load cannot read before that store. This PR adds this restriction
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This will abort the current build.
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