Revert "[libc++][ranges] Add benchmarks for the from_range constructors of vector and deque."

This reverts commit 390ac82.

It broke the sphinx publish bots for our documentation:
https://lab.llvm.org/buildbot/#/builders/242/builds/1130

because that machine has GCC 9.4.0 which does not know about C++23

Author: AaronBallman

libcxx/benchmarks/CMakeLists.txt

@@ -76,20 +76,7 @@ set(BENCHMARK_LIBCXX_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-libcxx)
 set(BENCHMARK_NATIVE_INSTALL ${CMAKE_CURRENT_BINARY_DIR}/benchmark-native)
 
 add_library(               cxx-benchmarks-flags INTERFACE)
-#TODO(cmake): remove the `add_compile_options`. Currently we have to explicitly
-# pass the `std:c++latest` flag on Windows to work around an issue where
-# requesting `cxx_std_23` results in an error -- somehow CMake fails to
-# translate the `c++23` flag into `c++latest`, and the highest numbered C++
-# version that MSVC flags support is C++20.
-if (MSVC)
-  add_compile_options(/std:c++latest)
-# ibm-clang does not recognize the cxx_std_32 flag, so use this as a temporary
-# workaround on AIX as well.
-elseif (${CMAKE_SYSTEM_NAME} MATCHES "AIX")
-  add_compile_options(-std=c++23)
-else()
-  target_compile_features( cxx-benchmarks-flags INTERFACE cxx_std_23)
-endif()
+target_compile_features(   cxx-benchmarks-flags INTERFACE cxx_std_20)
 target_compile_options(    cxx-benchmarks-flags INTERFACE -fsized-deallocation -nostdinc++)
 target_include_directories(cxx-benchmarks-flags INTERFACE "${LIBCXX_GENERATED_INCLUDE_DIR}"
                                                 INTERFACE "${BENCHMARK_LIBCXX_INSTALL}/include"

libcxx/benchmarks/ContainerBenchmarks.h

@@ -69,16 +69,6 @@ void BM_ConstructIterIter(benchmark::State& st, Container, GenInputs gen) {
   }
 }
 
-template <class Container, class GenInputs>
-void BM_ConstructFromRange(benchmark::State& st, Container, GenInputs gen) {
-  auto in = gen(st.range(0));
-  benchmark::DoNotOptimize(&in);
-  while (st.KeepRunning()) {
-    Container c(std::from_range, in);
-    DoNotOptimizeData(c);
-  }
-}
-
 template <class Container, class GenInputs>
 void BM_InsertValue(benchmark::State& st, Container c, GenInputs gen) {
   auto in        = gen(st.range(0));

libcxx/benchmarks/deque.bench.cpp

@@ -30,13 +30,4 @@ BENCHMARK_CAPTURE(BM_ConstructIterIter, deque_size_t, std::deque<size_t>{}, getR
 BENCHMARK_CAPTURE(BM_ConstructIterIter, deque_string, std::deque<std::string>{}, getRandomStringInputs)
     ->Arg(TestNumInputs);
 
-BENCHMARK_CAPTURE(BM_ConstructFromRange, deque_char, std::deque<char>{}, getRandomIntegerInputs<char>)
-    ->Arg(TestNumInputs);
-
-BENCHMARK_CAPTURE(BM_ConstructFromRange, deque_size_t, std::deque<size_t>{}, getRandomIntegerInputs<size_t>)
-    ->Arg(TestNumInputs);
-
-BENCHMARK_CAPTURE(BM_ConstructFromRange, deque_string, std::deque<std::string>{}, getRandomStringInputs)
-    ->Arg(TestNumInputs);
-
 BENCHMARK_MAIN();

libcxx/benchmarks/vector_operations.bench.cpp

@@ -30,13 +30,4 @@ BENCHMARK_CAPTURE(BM_ConstructIterIter, vector_size_t, std::vector<size_t>{}, ge
 BENCHMARK_CAPTURE(BM_ConstructIterIter, vector_string, std::vector<std::string>{}, getRandomStringInputs)
     ->Arg(TestNumInputs);
 
-BENCHMARK_CAPTURE(BM_ConstructFromRange, vector_char, std::vector<char>{}, getRandomIntegerInputs<char>)
-    ->Arg(TestNumInputs);
-
-BENCHMARK_CAPTURE(BM_ConstructFromRange, vector_size_t, std::vector<size_t>{}, getRandomIntegerInputs<size_t>)
-    ->Arg(TestNumInputs);
-
-BENCHMARK_CAPTURE(BM_ConstructFromRange, vector_string, std::vector<std::string>{}, getRandomStringInputs)
-    ->Arg(TestNumInputs);
-
 BENCHMARK_MAIN();