[libc++] Define namespace views in its own detail header.

Discovered in the comments on D118748: we would like this namespace to exist anytime Ranges exists, regardless of whether concepts syntax is supported. Also, we'd like to fully granularize the <ranges> header, which means not putting any loose declarations at the top level. Differential Revision: https://reviews.llvm.org/D118809 (cherry picked from commit 44cdca3)
tarunprabhu · Apr 4, 2023 · b310589 · b310589
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diff --git a/libcxx/test/libcxx/containers/views/span.cons/range.pass.cpp b/libcxx/test/libcxx/containers/views/span.cons/range.pass.cpp
diff --git a/libcxx/test/libcxx/containers/views/span.cons/range.verify.cpp b/libcxx/test/libcxx/containers/views/span.cons/range.verify.cpp