refactor(add-carry): with Clang on non-x86 (for example MacOS) use builtin add-carry instead of u128 #411
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…iltin add-carry instead of u128
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Potentially a quick win to accelerate Constantine on Apple M1~3.
See tracking compiler inefficiencies #357
Use addcarry builtin for Clang (GCC is incredibad) on non-x86 platforms.
To be benched with
CTT_ASM=0 CC=clang nimble bench_fp.