Refactor CPU ISA to be compiled instead of static
This commit introduces a new source file isa.c that implements functions to check for various CPU features across x86, ARM, and RISC-V architectures. This facilitate the definition of FFI for interfacing with other languages such as Rust or Python in automated tooling.
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The term FFI seems to mean you want to call cpuinfo from other languages, such as Cobol :-)
I have no strong opinion on the content of this PR, aside from it looks like you did it correctly. Is it possible to include a small unittest to demonstrate?