For tracking purpose: There are tests involving deque that currently cannot be marked as TEST_CONSTEXPR_CXX23 due to lack of constexpr support for deque. As a follow-up to making std::deque constexpr, these tests would need to be updated to be ~~TEST_CONSTEXPR_CXX23~~TEST_CONSTEXPR_CXX26, and the condition becomes TEST_STD_AT_LEAST_26_OR_RUNTIME_EVALUATED. The affected tests include:

PR: [libc++] Optimize ranges::{for_each, for_each_n} for segmented iterators #132896
libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/ranges.for_each.pass.cpp
libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/ranges.for_each_n.pass.cpp
libcxx/test/std/algorithms/alg.nonmodifying/alg.foreach/for_each.pass.cpp
PR: [libc++] Optimize std::{,ranges}::{fill,fill_n} for segmented iterators #132665
libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/fill_n.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/ranges.fill.pass.cpp
libcxx/test/std/algorithms/alg.modifying.operations/alg.fill/ranges.fill_n.pass.cpp

[libc++] P3372R3: constexpr deque #128656

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[libc++] P3372R3: constexpr `deque` #128656