[gomp4.1] Pretty print '+' for sink positive offsets

[Aldy Hernandez]

Positive numbers get no '+' by default, so the dumps look like this:

                #pragma omp ordered depend(sink:i1)

The attached patch fixes this oversight to print:

                #pragma omp ordered depend(sink:i+1)

OK for branch?

commit fc23dda3b860931ca72bf00236e3f929b48c751e
Author: Aldy Hernandez <al...@redhat.com>
Date:   Mon Jul 20 07:44:52 2015 -0700

        * tree-pretty-print.c (dump_omp_clause): Print '+' for positive
        numbers.

diff --git a/gcc/tree-pretty-print.c b/gcc/tree-pretty-print.c
index bd28844..d3cc245 100644
--- a/gcc/tree-pretty-print.c
+++ b/gcc/tree-pretty-print.c
@@ -566,8 +566,12 @@ dump_omp_clause (pretty_printer *pp, tree clause, int spc, 
int flags)
              {
                dump_generic_node (pp, TREE_VALUE (t), spc, flags, false);
                if (TREE_PURPOSE (t) != integer_zero_node)
-                 dump_generic_node (pp, TREE_PURPOSE (t), spc, flags,
-                                    false);
+                 {
+                   if (!wi::neg_p (TREE_PURPOSE (t)))
+                     pp_plus (pp);
+                   dump_generic_node (pp, TREE_PURPOSE (t), spc, flags,
+                                      false);
+                 }
                if (TREE_CHAIN (t))
                  pp_comma (pp);
              }