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At the recent ISO C++ Committee meeting in San Diego it was decided [1]
to make std::span SemiRegular and drop its comparison operators [2]. For
further info see also this blog post [3].

This change updates the base::span implemention appropriately and
replaces prior usages of the comparison operators with their STL
algorithm equivalent.

[1] http://redd.it/9vwvbz
[2] https://wg21.link/p1085
[3] https://abseil.io/blog/20180531-regular-types#evaluating-span

Bug: 828324
Change-Id: I94e94450df5f233b6de81da81f309386e0dcf4a7
Reviewed-on: https://chromium-review.googlesource.com/c/1337628Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Jun Choi <hongjunchoi@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608702}