Microsoft's __uuidof operator returns a lvalue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122021 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ExprClassification.cpp

@@ -303,7 +303,7 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
   }
       
   case Expr::CXXUuidofExprClass:
-    return Cl::CL_PRValue;
+    return Cl::CL_LValue;
   }
   
   llvm_unreachable("unhandled expression kind in classification");

test/Parser/MicrosoftExtensions.c

@@ -77,6 +77,8 @@ void uuidof_test2()
    C c;
    // FIXME, this must not compile
   _uuidof(c);
+
+  &_uuidof(0);
 }
 
 /* Microsoft attribute tests */