vectorize std::search

[hiraditya]

As part of #84663

std::search is quite similar to std::string::find and I've already implemented a vectorized version of it in libc++ (with a combination of memchr+memcmp). So it should be possible to vectorize std::search for several primitive data types.

[wsehjk]

hi, this is interesting. Can you assign this to me? Thank you.

[hiraditya]

hi, this is interesting. Can you assign this to me? Thank you.

hey, i was trying this myself for a bit. in the meantime you can look at improving #112397 as there has been no progress on that for past couple of months. Also #129316 is an easy one.

[wsehjk]

All right. I will check the parent issue #84663. Thanks