1. Update the AES-GCM with AES-NI 128-bit constant initializers so they work on both GCC/Clang and MSC.
* MSC uses a union for the type where the first member is a 16-byte array.
* GCC/Clang uses a 16-byte vector masking as a long long array.
2. Disable AES-GCM loop unrolling for Windows, when using AES-NI in 32-bit mode.
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