Bug 1678990 - Use __ARM_FEATURE_CRYPTO for feature detection. r=bbeurdouche Actually, we have CPU feature detection for Linux and FreeBSD on aarch64 platform. But others don't. macOS doesn't has any CPU feature detection for ARM Crypto Extension, but toolchain default is turned on. So we should respect __ARM_FEATURE_CRYPTO. Differential Revision: https://phabricator.services.mozilla.com/D97909

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