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Auto merge of #102655 - joboet:windows_tls_opt, r=ChrisDenton
Optimize TLS on Windows This implements the suggestion in the current TLS code to embed the linked list of destructors in the `StaticKey` structure to save allocations. Additionally, locking is avoided when no destructor needs to be run. By using one Windows-provided `Once` per key instead of a global lock, locking is more finely-grained (this unblocks #100579).
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