CXXConditionDeclExpr expression node is an lvalue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@56093 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/Expr.cpp

@@ -460,6 +460,8 @@ Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
             ? LV_InvalidExpression : LV_Valid);
   case CXXDefaultArgExprClass:
     return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
+  case CXXConditionDeclExprClass:
+    return LV_Valid;
   default:
     break;
   }