In the non-x64 fallback code path, use the system ld.

ld

Index: ld
===================================================================
--- ld	(revision 120368)
+++ ld	(working copy)
@@ -1,5 +1,5 @@
 #!/bin/sh
-# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
@@ -14,5 +14,6 @@
 if [ "$machine" = "x86_64-linux-gnu" ]; then
     exec $base_dir/gold64 "$@"
 else
-    exec $base_dir/ld.bfd "$@"
+    # Fall back on the ld found in $PATH.
+    exec ld "$@"
 fi