Use SET_DECL_MODE in libcc1

2017-07-05  Richard Sandiford  <richard.sandiford@linaro.org>

libcc1/
	* libcp1plugin.cc (plugin_build_field): Use SET_DECL_MODE.

From-SVN: r250004

libcc1/ChangeLog

+2017-07-05  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* libcp1plugin.cc (plugin_build_field): Use SET_DECL_MODE.
+
 2017-06-30  Nathan Sidwell  <nathan@acm.org>
 
 	* libcp1plugin.cc (plugin_build_decl): Use make_conv_op_name.

libcc1/libcp1plugin.cc

@@ -1887,7 +1887,7 @@ plugin_build_field (cc1_plugin::connection *,
 	= c_build_bitfield_integer_type (bitsize, TYPE_UNSIGNED (field_type));
     }
 
-  DECL_MODE (decl) = TYPE_MODE (TREE_TYPE (decl));
+  SET_DECL_MODE (decl, TYPE_MODE (TREE_TYPE (decl)));
 
   // There's no way to recover this from DWARF.
   SET_DECL_OFFSET_ALIGN (decl, TYPE_PRECISION (pointer_sized_int_node));