How to patch Meltdown and Spectre vulnerabilities on FreeBSD

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All supported versions of FreeBSD affected by Meltdown (CVE-2017-5754), Spectre variant 1 (CVE-2017-5753), and Spectre variant 2 (CVE-2017-5715). How do I patch Meltdown and Spectre vulnerabilities on FreeBSD (speculative execution vulnerabilities) server powered by 64 bit Intel CPU?