[libc++] [test_iterators] Make all ADL base() functions into hidden friends. NFCI.
authorArthur O'Dwyer <arthur.j.odwyer@gmail.com>
Tue, 7 Dec 2021 19:08:23 +0000 (14:08 -0500)
committerArthur O'Dwyer <arthur.j.odwyer@gmail.com>
Wed, 8 Dec 2021 21:41:01 +0000 (16:41 -0500)
commit67c43d87cd53fdbd75dea6da8dbbd0762357864a
tree36fedff5511100065538df22d67f3233f7afb1ef
parentaff028f7d8322c625422febd3d8b9794746cdc5b
[libc++] [test_iterators] Make all ADL base() functions into hidden friends. NFCI.

This follows up on my addition of base(cpp20_input_iterator) in D115177,
making all the ADL base() functions consistent.
Also align cpp20_input_iterator with the other test iterators' style.

Reviewed as part of D115272.
libcxx/test/support/test_iterators.h