[wide-int] Fix ada builds

[Richard Sandiford]

I applied this obvious patch to get the ada frontend building.

Richard


Index: gcc/ada/gcc-interface/decl.c
===================================================================
--- gcc/ada/gcc-interface/decl.c        (revision 204174)
+++ gcc/ada/gcc-interface/decl.c        (working copy)
@@ -1658,7 +1658,7 @@
          TYPE_PRECISION (gnu_type) = esize;
          TYPE_UNSIGNED (gnu_type) = is_unsigned;
          set_min_and_max_values_for_integral_type (gnu_type, esize,
-                                                   is_unsigned);
+                                                   TYPE_SIGN (gnu_type));
          process_attributes (&gnu_type, &attr_list, true, gnat_entity);
          layout_type (gnu_type);
 
@@ -7492,11 +7492,9 @@
       if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST)
        {
          tree op1 = TREE_OPERAND (gnu_size, 1);
-         wide_int signed_op1
-           = wide_int::from_tree (op1).sforce_to_size (TYPE_PRECISION 
(sizetype));
-         if (signed_op1.neg_p ())
+         if (wi::neg_p (op1))
            {
-             op1 = wide_int_to_tree (sizetype, -signed_op1);
+             op1 = wide_int_to_tree (sizetype, wi::neg (op1));
              pre_op1 = annotate_value (build1 (NEGATE_EXPR, sizetype, op1));
            }
        }