Define additional x86-64 micro-architecture levels

The concept was described in this mailing list thread:

The names of the CPU features come from this document:

Intel® 64 and IA-32 Architectures Software Developer’s Manual
Combined Volumes: 1, 2A, 2B, 2C, 2D, 3A, 3B, 3C, 3D, and 4
Submitted: May 01, 2018, Last updated: May 27, 2020
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