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Implement atomic_min/max #1718

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@RalfJung

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@RalfJung

In rust-lang/rust#82391 I had to disable some tests because Miri does not support atomic_min/max.

In #1653, an attempt was made to implement those intrinsics. The general approach looks good but see that PR for some of the remaining issues that need to be solved before landing this (also, there'll be lots of conflicts due to #1716).

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    A-concurrencyArea: affects our concurrency (multi-thread) supportA-shimsArea: This affects the external function shimsE-good-first-issueA good way to start contributing, mentoring is available

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