This is asmjit from https://github.com/asmjit/asmjit/tree/eae7197fce03fd52a6e71ca89207a88ce270fb1a (aarch64 branch from 2021-12-14)

There are some modifications that are marked with "B-Human modification", i.e. this is an "altered source version" according to section 2 of the license.