Add Equatable and Hashable conformance to GUID. #84792
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On Windows, `GUID` is a currency type and (along with its various typedefs) is used pervasively Windows offers `IsEqualGUID()` and `UuidHash()` for comparing and hashing them, respectively, but `IsEqualGUID()` is a macro in C mode and `UuidHash()` only provides a 16-bit hash. We should provide conformance to these protocols in the WinSDK overlay to provide equivalent functionality in Swift.
grynspan force-pushed the jgrynspan/windows-GUID-hashable branch from 9fd42ec to baf4506 Compare 
compnerd reviewed Oct 9, 2025
compnerd reviewed Oct 9, 2025
compnerd approved these changes Oct 9, 2025
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On Windows,
GUIDis a currency type and (along with its various typedefs) is used pervasively Windows offersIsEqualGUID()andUuidHash()for comparing and hashing them, respectively, butIsEqualGUID()is a macro in C mode andUuidHash()only provides a 16-bit hash. We should provide conformance to these protocols in the WinSDK overlay to provide equivalent functionality in Swift.