Following up to D119685, all in one PR to conserve buildkite cycles but to be landed as 9 separate commits just in case:
8b4bf85dedf5 [libc++] [test] Qualify calls to std::get(tuple). NFCI.
ce10eef48c53 [libc++] [test] Qualify calls to std::rethrow_exception. NFCI.
fca25413869d [libc++] [test] Qualify calls to std::atomic_flag_{clear,test} functions. NFCI.
398771c2a181 [libc++] [test] Qualify calls to std::getline. NFCI.
1e3e60cc44e1 [libc++] [test] Qualify iomanip functions in std/input.output/iostream.format/. NFCI.
23cebc56c5d8 [libc++] [test] Qualify calls to iomanip functions in std/localization/. NFCI.
f528c5c4e64c [libc++] [test] Qualify `prev` as `std::prev` in a lot of tests. NFCI.
2986d0a23e2e [libc++] [test] Qualify `next` as `std::next` in a lot of tests. NFCI.
8256cb470412 [libc++] [test] Qualify `move` as `std::move` in a lot of tests. NFCI.As discussed in D119685, if buildkite is happy with this (which I expect), I'm just going to push it.