[clang] [clang-cl] Support the /std:c++23 option (PR #232659)

[Hans Wennborg via cfe-commits]

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@@ -7794,12 +7794,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                              .Case("c++14", "-std=c++14")
                              .Case("c++17", "-std=c++17")
                              .Case("c++20", "-std=c++20")
+                             .Case("c++23", "-std=c++23")
                              // If you add cases below for spellings that are
                              // not in LangStandards.def, update
                              // TransferableCommand::tryParseStdArg() in
                              // lib/Tooling/InterpolatingCompilationDatabase.cpp
                              // to match.
-                             // TODO add c++23, c++26, c++29 when MSVC supports
+                             // TODO add c++26, c++29 when MSVC supports
                              // it.
                              .Case("c++23preview", "-std=c++23")
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zmodem wrote:

I just saw a user asking for exactly this: https://devblogs.microsoft.com/cppblog/msvc-build-tools-version-14-52-release-candidate-now-available/?commentid=2831#comment-2831

https://github.com/llvm/llvm-project/pull/232659