syncing libiberty/ and include/ from GCC?

[Nick Alcock]

On 24 Jun 2020, H. J. Lu outgrape:

> Please give this patch a try.

Looks good! Thank you!

A bunch of local tests coming up here, but you can expect my first patch
series in way too long shortly (one I already posted in January but
reviewing got blocked on the bsearch_r-is-in-libiberty issue), followed
once I've done a bunch more local testing and benchmarking by a monster
58-patch series which gives us CTF type deduplication in ld and a CTF
testsuite at long last!