fold: fix use of protected_set_expr_location_unshare

Unlike protected_set_expr_location, this variant can return
a different tree.

gcc/ChangeLog:

	* fold-const.cc (fold_convert_loc): Check return value of
	protected_set_expr_location_unshare.

diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
index 42547f4..00e2af0 100644 (file)
--- a/gcc/fold-const.cc
+++ b/gcc/fold-const.cc
@@ -2618,7 +2618,7 @@ fold_convert_loc (location_t loc, tree type, tree arg)
       gcc_unreachable ();
     }
  fold_convert_exit:
-  protected_set_expr_location_unshare (tem, loc);
+  tem = protected_set_expr_location_unshare (tem, loc);
   return tem;
 }
 \f