I had a reference to https://sourceware.org/binutils/docs/as/AArch64-Extensions.html https://sourceware.org/binutils/docs/as/AArch64-Extensions.h... that I cut

I had a reference to https://sourceware.org/binutils/docs/as/AArch64-Extensions.html https://sourceware.org/binutils/docs/as/AArch64-Extensions.h... that I cut from my rough draft that I do miss.