Make FYI bot test script exit with nonzero status if any tests fail.

buildbot/buildbot_pnacl_toolchain_tests.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.
 
 # Run toolchain torture tests and llvm testsuite tests.
 # For now, run on linux64, build and run unsandboxed newlib tests
 # for all 3 architectures.
 # Note: This script builds the toolchain from scratch but does
 #       not build the translators and hence the translators
@@ skipping 21 matching lines @@
 # Change the  toolchain build script (PNACL_BUILD) behavior slightly
 # wrt to error logging and mecurial retry delays.
 # TODO(robertm): if this special casing is still needed,
 #                make this into separate vars
 export PNACL_BUILDBOT=true
 # Make the toolchain build script (PNACL_BUILD) more verbose.
 # This will also prevent bot timeouts which otherwise gets triggered
 # by long periods without console output.
 export PNACL_VERBOSE=true
 
+EXIT_STATUS=0
+
 clobber() {
   echo @@@BUILD_STEP clobber@@@
   rm -rf scons-out
   # Don't clobber pnacl_translator; these bots currently don't build
   # it, but they use the DEPSed-in version.
   rm -rf toolchain/linux_x86/pnacl_newlib* \
       toolchain/mac_x86/pnacl_newlib* \
       toolchain/win_x86/pnacl_newlib*
 }
 
 handle-error() {
   echo "@@@STEP_FAILURE@@@"
+  EXIT_STATUS=1
 }
 
 ignore-error() {
   echo "@==  IGNORING AN ERROR  ==@"
 }
 
 #### Support for running arm sbtc tests on this bot, since we have
 # less coverage on the main waterfall now:
 # http://code.google.com/p/nativeclient/issues/detail?id=2581
 readonly SCONS_COMMON="./scons --verbose bitcode=1 -j${PNACL_CONCURRENCY}"
@@ skipping 182 matching lines @@
     # Note: the tests which use sandboxed translation are at the end,
     # because they can sometimes hang on arm, causing buildbot to kill the
     # script without running any more tests.
     scons-tests-translator ${arch}
 
     if [[ ${arch} = x86-64 ]] ; then
       scons-tests-x86-64-zero-based-sandbox
     fi
 
   done
+  exit $EXIT_STATUS
 }
 
 
 if [ $# = 0 ]; then
   # NOTE: this is used for manual testing only
   tc-test-bot "x86-64 x86-32 arm"
 else
   "$@"
 fi