Performance methodology

In the following section, we explore the following as understood at the time of writing:

• Meaningful software comparisons (e.g., 64-bit aarch64 vs pure-capability aarch64c, OSes, etc)
• Known limitations of the Morello processor design and SoC, as well as the data-dependency fix used in our measurements
• Known limitations of the Morello software stack including ABIs and toolchain