Fix unsupported

Author: ldionne

libcxx/test/benchmarks/algorithms/nonmodifying/ends_with.bench.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
 #include <algorithm>
 #include <cassert>

libcxx/test/benchmarks/algorithms/nonmodifying/find_last.bench.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
 #include <algorithm>
 #include <cstddef>

libcxx/test/benchmarks/algorithms/nonmodifying/fold.bench.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
 #include <algorithm>
 #include <cstddef>