llvm: more tentatives at optimal field addition with pure LLVM IR#457
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This PR has changes behind the code generator from #456 that triggered issues: - https://github.com/llvm/llvm-project/issues/103841 - https://github.com/llvm/llvm-project/issues/103855 - https://github.com/llvm/llvm-project/issues/103946 for Bigints of size 254/255 the LLVM IR has better worst case codegen than builtin llvm.usub.with.overflow (1~2 extra instructions instead of 33% extra instructions https://github.com/mratsim/constantine/issues/357#issuecomment-2288608867) but for size 256 it degrades to 66% extra instructions.
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