Add a Subzero configuration to LLVM testsuite bot testing. x86-32 only.

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 178 matching lines @@
     fi
     echo "@@@BUILD_STEP torture_tests $arch @@@"
     ${TORTURE_TEST} pnacl ${arch} --verbose \
       --concurrency=${PNACL_CONCURRENCY} || handle-error
   done
 
 
   local optset
   optset[1]="--opt O3f --opt O2b"
   for arch in ${archset}; do
-    # Run all appropriate frontend/backend optimization combinations.
-    # For now, this means running 2 combinations for x86 since each
-    # takes about 20 minutes on the bots, and making a single run
-    # elsewhere since e.g. arm takes about 75 minutes.  In a perfect
-    # world, all 4 combinations would be run.
+    # Run all appropriate frontend/backend optimization combinations.  For now,
+    # this means running 2 combinations for x86 (plus one more for Subzero on
+    # x86-32) since each takes about 20 minutes on the bots, and making a single
+    # run elsewhere since e.g. arm takes about 75 minutes.  In a perfect world,
+    # all 4 combinations would be run, plus more for Subzero.
     if [[ ${archset} =~ x86 ]]; then
       optset[2]="--opt O3f --opt O0b"
+      if [[ ${archset} == x86-32 ]]; then
+        # Run a Subzero -O2 test set on x86-32.
+        optset[3]="--opt O3f --opt O2b_sz"
+      fi
     fi
     for opt in "${optset[@]}"; do
       echo "@@@BUILD_STEP llvm-test-suite ${arch} ${opt} @@@"
       python ${LLVM_TEST} --testsuite-clean
       LD_LIBRARY_PATH=${LIBRARY_ABSPATH} python ${LLVM_TEST} \
         --testsuite-configure --testsuite-run --testsuite-report \
         --arch ${arch} ${opt} -v -c || handle-error
     done
 
     echo "@@@BUILD_STEP libcxx-test ${arch} @@@"
@@ skipping 19 matching lines @@
   done
 }
 
 
 if [ $# = 0 ]; then
   # NOTE: this is used for manual testing only
   tc-test-bot "x86-64 x86-32 arm"
 else
   "$@"
 fi