P3136R1 was essentially implemented in LLVM 14

See https://reviews.llvm.org/D116570.

Author: frederick-vs-ja

libcxx/docs/Status/Cxx2cPapers.csv

@@ -76,7 +76,7 @@
 "`P2422R1 <https://wg21.link/P2422R1>`__","Remove ``nodiscard`` annotations from the standard library specification","2024-06 (St. Louis)","|Complete|","19","``nodiscard`` attributes were kept as a conforming extension"
 "`P2300R10 <https://wg21.link/P2300R10>`__","``std::execution``","2024-06 (St. Louis)","","",""
 "","","","","",""
-"`P3136R1 <https://wg21.link/P3136R1>`__","Retiring niebloids","2024-11 (Wrocław)","|Nothing To Do|","","libc++ has been implementing niebloids as customization point objects since they are initially added."
+"`P3136R1 <https://wg21.link/P3136R1>`__","Retiring niebloids","2024-11 (Wrocław)","|Complete|","14",""
 "`P3138R5 <https://wg21.link/P3138R5>`__","``views::cache_latest``","2024-11 (Wrocław)","","",""
 "`P3379R0 <https://wg21.link/P3379R0>`__","Constrain ``std::expected`` equality operators","2024-11 (Wrocław)","","",""
 "`P2862R1 <https://wg21.link/P2862R1>`__","``text_encoding::name()`` should never return null values","2024-11 (Wrocław)","","",""

libcxx/test/std/library/description/conventions/customization.point.object/niebloid.compile.pass.cpp

@@ -32,7 +32,7 @@
 //
 // As of P3136R1, niebloids (formally known as algorithm function objects) are required to be CPOs.
 //
-// libc++ always implements niebloids in the same way as CPOs;
+// libc++ implements niebloids in the same way as CPOs since LLVM 14;
 // therefore this file should stay in sync with ./cpo.compile.pass.cpp.
 
 template <class CPO, class... Args>