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Minor improvements to Windows TLS dtors
This does a few things:
* Moves keyless dtors into the same module as the `on_tls_callback` function because of dylib mess. We keep the `inline(never)` hints as a precaution (see also the issue they link to).
* Introduces the `HAS_DTORS` atomic as an optimization hint. This allows removing (most) of the TLS dtor code if no dtors are ever run. Otherwise it's always included because of a `#[used]`.
* Only run either keyed dtors or keyless dtors but not both. They should be mutually exclusive as keyed dtors are a fallback. I've also added an `assert` to make sure this is true.
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