Revert "[Clang] Fix variant crashes from GH58028, GH57370"

This reverts commit 9706bb3165, some CI workers complain about the test.

clang/lib/Sema/SemaInit.cpp

@@ -696,9 +696,9 @@ void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
         //   ill-formed.
         SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
           << Field->getType()
-            << (ILE->isSyntacticForm() ? ILE : ILE->getSyntacticForm())
+          << ILE->getSyntacticForm()->getSourceRange();
-                   ->getSourceRange();
+        SemaRef.Diag(Field->getLocation(),
-        SemaRef.Diag(Field->getLocation(), diag::note_uninit_reference_member);
+                     diag::note_uninit_reference_member);
       }
       hadError = true;
       return;

clang/test/SemaCXX/specialization-diagnose-crash.cpp

@@ -1,24 +0,0 @@
-// RUN: %clang_cc1 -fsyntax-only %s -verify
-// This is a reduction of GH57370 and GH58028, originally appearing
-// in libstdc++'s variant code.
-
-struct V1 {};
-struct V2 : V1 {
-  int &a;
-};
-
-template <class T> using void_t = void;
-
-template <class T> struct X { T x; };
-
-template <class T1, class T2, class = void> struct Variant {
-  Variant() = delete; // expected-note {{deleted here}}
-};
-
-template <class T1, class T2>
-struct Variant<T1, T2, void_t<decltype(X<T2>{T1()})>> {};
-
-void f() {
-  Variant<V1, V1>();
-  Variant<V1, V2>(); // expected-error {{call to deleted constructor}}
-}