[clang] Revert "[Clang][C++23] Implement P2448R2 ..." (PR #85136)

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git-clang-format --diff ccfb9e6eb7429885e6d09e99cf89bce41f1ca3cc 2f67dfb012038678dd0b873394a55bd5c937f843 -- clang/lib/AST/DeclCXX.cpp clang/lib/Sema/SemaDeclCXX.cpp clang/test/AST/Interp/cxx23.cpp clang/test/CXX/class/class.compare/class.compare.default/p3.cpp clang/test/CXX/class/class.compare/class.compare.default/p4.cpp clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/dtor.cpp clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3-2b.cpp clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p3.cpp clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p4.cpp clang/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.default/p2.cpp clang/test/CXX/drs/dr13xx.cpp clang/test/CXX/drs/dr14xx.cpp clang/test/CXX/drs/dr15xx.cpp clang/test/CXX/drs/dr16xx.cpp clang/test/CXX/drs/dr6xx.cpp clang/test/CXX/expr/expr.const/p5-26.cpp clang/test/CXX/special/class.copy/p13-0x.cpp clang/test/SemaCXX/constant-expression-cxx11.cpp clang/test/SemaCXX/constant-expression-cxx14.cpp clang/test/SemaCXX/constant-expression-cxx2b.cpp clang/test/SemaCXX/cxx2a-consteval.cpp clang/test/SemaCXX/deduced-return-type-cxx14.cpp
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diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 199f2523cf..b14699894b 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -1743,8 +1743,7 @@ static bool CheckConstexprDestructorSubobjects(Sema &SemaRef,
 
 /// Check whether a function's parameter types are all literal types. If so,
 /// return true. If not, produce a suitable diagnostic and return false.
-static bool CheckConstexprParameterTypes(Sema &SemaRef,
-                                         const FunctionDecl *FD,
+static bool CheckConstexprParameterTypes(Sema &SemaRef, const FunctionDecl *FD,
                                          Sema::CheckConstexprKind Kind) {
   unsigned ArgIndex = 0;
   const auto *FT = FD->getType()->castAs<FunctionProtoType>();
@@ -7858,7 +7857,8 @@ bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD,
       MD->isConstexpr() && !Constexpr &&
       MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) {
         if (!MD->isConsteval() && RD->getNumVBases()) {
-          Diag(MD->getBeginLoc(), diag::err_incorrect_defaulted_constexpr_with_vb)
+          Diag(MD->getBeginLoc(),
+               diag::err_incorrect_defaulted_constexpr_with_vb)
               << CSM;
           for (const auto &I : RD->vbases())
             Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here);
@@ -7868,8 +7868,8 @@ bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD,
                                       : diag::err_incorrect_defaulted_constexpr)
               << CSM;
         }
-    // FIXME: Explain why the special member can't be constexpr.
-    HadError = true;
+        // FIXME: Explain why the special member can't be constexpr.
+        HadError = true;
   }
 
   if (First) {

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https://github.com/llvm/llvm-project/pull/85136