[libcxx][ranges] Add ranges::iota_view.

Differential Revision: https://reviews.llvm.org/D107396

Author: zoecarver

libcxx/docs/Status/RangesPaper.csv

@@ -138,7 +138,7 @@ Section,Description,Dependencies,Assignee,Complete
 `[range.view.ref] <http://wg21.link/range.view>`_,`ref-view <https://llvm.org/D102020>`_,[view.interface],Zoe Carver,✅
 `[range.filter] <http://wg21.link/range.filter>`_,filter_view,[range.all],Louis Dionne,Not started
 `[range.transform] <http://wg21.link/range.transform>`_,`transform_view <https://llvm.org/D103056>`_,[range.all],Zoe Carver,✅
-`[range.iota] <http://wg21.link/range.iota>`_,iota_view,[range.all],Zoe Carver,In Progress
+`[range.iota] <http://wg21.link/range.iota>`_,iota_view,[range.all],Zoe Carver,✅
 `[range.take] <http://wg21.link/range.take>`_,take_view,[range.all],Zoe Carver,✅
 `[range.join] <http://wg21.link/range.join>`_,join_view,[range.all],Zoe Carver,In Progress
 `[range.empty] <http://wg21.link/range.empty>`_,`empty_view <https://llvm.org/D103208>`_,[view.interface],Zoe Carver,✅

libcxx/include/CMakeLists.txt

@@ -223,6 +223,7 @@ set(files
   __ranges/empty.h
   __ranges/enable_borrowed_range.h
   __ranges/enable_view.h
+  __ranges/iota_view.h
   __ranges/non_propagating_cache.h
   __ranges/ref_view.h
   __ranges/reverse_view.h

libcxx/include/__iterator/concepts.h

@@ -72,6 +72,8 @@ concept __signed_integer_like = signed_integral<_Tp>;
 
 template<class _Ip>
 concept weakly_incrementable =
+  // TODO: remove this once the clang bug is fixed (bugs.llvm.org/PR48173).
+  !same_as<_Ip, bool> && // Currently, clang does not handle bool correctly.
   movable<_Ip> &&
   requires(_Ip __i) {
     typename iter_difference_t<_Ip>;