Go patch committed: In Sort_bindings handle same value passed twice

[Ian Lance Taylor via Gcc-patches]

This patch by zhangjian to the Go frontend changes Sort_bindings to
return false if comparing a value to itself.  Apparently some versions
of std::sort may pass elements at the same iterator location.  This
fixes https://go.dev/issue/53483.  Bootstrapped and ran Go testsuite
on x86_64-pc-linux-gnu.  Committed to mainline.

Ian

5ee8e1d1b0c0d9f6310d27a37a6162e0be80e413
diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 629bc666dc0..f882812d219 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-6c3752315dc9b82d0f3f3ac646a1e7376818f84a
+6b314f7947b4b31a86c09d166fe6664cd9968824
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/gcc/go/gofrontend/export.cc b/gcc/go/gofrontend/export.cc
index a30b11af31e..7373deee310 100644
--- a/gcc/go/gofrontend/export.cc
+++ b/gcc/go/gofrontend/export.cc
@@ -530,6 +530,9 @@ struct Sort_bindings
   bool
   operator()(const Named_object* n1, const Named_object* n2) const
   {
+    if (n1 == n2)
+      return false;
+
     if (n1->package() != n2->package())
       {
        if (n1->package() == NULL)