Adds tls_edit utility which patches irt_core.nexe's TLS usage.

tests/spec2k/run_all.sh

 #!/bin/bash
 
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 set -o nounset
 set -o errexit
 
 # The script is located in "native_client/tests/spec2k"
@@ skipping 570 matching lines @@
   echo ${SPEC2K_SCRIPT}
 }
 
 #+
 #+ CheckFileBuilt <depname> <file> -
 #+
 #+   Check that a dependency is actually built.
 CheckFileBuilt() {
   local depname="$1"
   local filename="$2"
-  if [[ ! -x "${filename}" ]] ; then
+  if [[ ! -f "${filename}" ]] ; then
     echo "You have not built ${depname} yet (${filename})!" 1>&2
     exit -1
   fi
 }
 
 #+
 #+ SetupSelLdr <arch> <prefix> <extra_flags> <preload>
 #+
 #+   Set up PREFIX to run sel_ldr on <arch>.
 #+   <prefix> precedes sel_ldr in the command.
@@ skipping 366 matching lines @@
 
 [ $# = 0 ] && set -- help  # Avoid reference to undefined $1.
 
 if [ "$(type -t $1)" != "function" ]; then
   Usage
   echo "ERROR: unknown mode '$1'." >&2
   exit 1
 fi
 
 "$@"