PR48545: Access check the inherited constructor, not the inheriting

constructor.

We got this wrong only when forming a CXXTemporaryObjectExpr, which
caused the bug to only appear for certain syntactic forms.

clang/lib/Sema/SemaInit.cpp

@@ -6536,22 +6536,23 @@ PerformConstructorInitialization(Sema &S,
         ? SourceRange(LBraceLoc, RBraceLoc)
         : Kind.getParenOrBraceRange();
 
+    CXXConstructorDecl *CalleeDecl = Constructor;
     if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(
             Step.Function.FoundDecl.getDecl())) {
-      Constructor = S.findInheritingConstructor(Loc, Constructor, Shadow);
-      if (S.DiagnoseUseOfDecl(Constructor, Loc))
+      CalleeDecl = S.findInheritingConstructor(Loc, Constructor, Shadow);
+      if (S.DiagnoseUseOfDecl(CalleeDecl, Loc))
         return ExprError();
     }
-    S.MarkFunctionReferenced(Loc, Constructor);
+    S.MarkFunctionReferenced(Loc, CalleeDecl);
 
     CurInit = S.CheckForImmediateInvocation(
         CXXTemporaryObjectExpr::Create(
-            S.Context, Constructor,
+            S.Context, CalleeDecl,
             Entity.getType().getNonLValueExprType(S.Context), TSInfo,
             ConstructorArgs, ParenOrBraceRange, HadMultipleCandidates,
             IsListInitialization, IsStdInitListInitialization,
             ConstructorInitRequiresZeroInit),
-        Constructor);
+        CalleeDecl);
   } else {
     CXXConstructExpr::ConstructionKind ConstructKind =
       CXXConstructExpr::CK_Complete;

clang/test/SemaCXX/cxx11-inheriting-ctors.cpp

@@ -142,3 +142,24 @@ namespace PR47555 {
   };
   template void f<int>();
 }
+
+namespace PR48545 {
+  struct B {
+      void f();
+  private:
+      B(int, int = 0);
+  };
+  struct D : B { using B::B; };
+  void B::f() {
+      D{0};
+      D{0, 0};
+      D(0);
+      D(0, 0);
+      D u = {0};
+      D v = {0, 0};
+      D w{0};
+      D x{0, 0};
+      D y(0);
+      D z(0, 0);
+  }
+}