[Clang] Fix crash due to invalid source location in __is_trivially_equality_comparable (#107815)

Fixes #107777

(cherry picked from commit 6dbdb84)

Author: philnik777

clang/lib/Sema/SemaExprCXX.cpp

@@ -5140,7 +5140,8 @@ static bool HasNonDeletedDefaultedEqualityComparison(Sema &S,
 
     // const ClassT& obj;
     OpaqueValueExpr Operand(
-        {}, Decl->getTypeForDecl()->getCanonicalTypeUnqualified().withConst(),
+        KeyLoc,
+        Decl->getTypeForDecl()->getCanonicalTypeUnqualified().withConst(),
         ExprValueKind::VK_LValue);
     UnresolvedSet<16> Functions;
     // obj == obj;

clang/test/SemaCXX/type-traits.cpp

@@ -3958,6 +3958,24 @@ class Template {};
 // Make sure we don't crash when instantiating a type
 static_assert(!__is_trivially_equality_comparable(Template<Template<int>>));
 
+
+struct S operator==(S, S);
+
+template <class> struct basic_string_view {};
+
+struct basic_string {
+  operator basic_string_view<int>() const;
+};
+
+template <class T>
+const bool is_trivially_equality_comparable = __is_trivially_equality_comparable(T);
+
+template <int = is_trivially_equality_comparable<basic_string> >
+void find();
+
+void func() { find(); }
+
+
 namespace hidden_friend {
 
 struct TriviallyEqualityComparable {