[clang] [Clang][C++23] Core language changes from P1467R9 extended floating-point types and standard names. (PR #78503)

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@@ -453,8 +453,12 @@ static void InitializeStandardPredefinedMacros(const 
TargetInfo &TI,
     if (LangOpts.CPlusPlus26)
       // FIXME: Use correct value for C++26.
       Builder.defineMacro("__cplusplus", "202400L");
-    else if (LangOpts.CPlusPlus23)
+    else if (LangOpts.CPlusPlus23) {
       Builder.defineMacro("__cplusplus", "202302L");
+      // [C++23] 15.11p2 [cpp.predefined]
+      Builder.defineMacro("__STDCPP_FLOAT16_T__", "1");
----------------
cor3ntin wrote:

Right there is `TargetInfo::hasFloat16Type` / `hasFullBFloat16Type`.
We probably want to check that both here, and when creating such type during 
parsing

https://github.com/llvm/llvm-project/pull/78503
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