Remove i686-hosted Linux build and start switching to new directory layout

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 273 matching lines @@
   # Only build MIPS stuff on mips bots
   if [[ ${archset} == "mips" ]]; then
     export PNACL_BUILD_MIPS=true
     # Don't run any of the tests yet
     echo "MIPS bot: Only running build, and not tests"
     archset=
   fi
 
   # Build the un-sandboxed toolchain. The build script outputs its own buildbot
   # annotations.
-  # Build and use the 64-bit llvm build, to get 64-bit versions of the build
-  # tools such as fpcmp (used for llvm test suite). For some reason it matters
-  # that they match the build machine. TODO(dschuff): Is this still necessary?
-  ${TOOLCHAIN_BUILD} --verbose --sync --clobber --build-64bit-host \
-    --testsuite-sync \
+  ${TOOLCHAIN_BUILD} --verbose --sync --clobber --testsuite-sync \
     --install toolchain/linux_x86/pnacl_newlib
 
   # Linking the tests require additional sdk libraries like libnacl.
   # Do this once and for all early instead of attempting to do it within
   # each test step and having some late test steps rely on early test
   # steps building the prerequisites -- sometimes the early test steps
   # get skipped.
   echo "@@@BUILD_STEP install sdk libraries @@@"
   ${PNACL_BUILD} sdk
   for arch in ${archset}; do
@@ skipping 58 matching lines @@
   done
 }
 
 
 if [ $# = 0 ]; then
   # NOTE: this is used for manual testing only
   tc-test-bot "x86-64 x86-32 arm"
 else
   "$@"
 fi