[Bug ld/18829] Add the ability to sort PLT entries

[gregory.d.bentley at intel dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18829

--- Comment #5 from Greg Bentley <gregory.d.bentley at intel dot com> ---
(In reply to Alexander Monakov from comment #3)
> As I understand, for further benefit you should sort the GOT as well as PLT
> based on the same idea — and that will save you some dcache misses even with
> -fno-plt.

That's correct. However, I didn't see a noticeable difference with my workload
from improving the GOT cache behavior. My previous patch resulted in sorted
GOTs except when -z bndplt was used. I've fixed that in the patch just
uploaded.

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