Subzero: Run sandboxed cross tests, and do some cleanup.

pydir/run-pnacl-sz.py

Index: pydir/run-pnacl-sz.py
diff --git a/pydir/run-pnacl-sz.py b/pydir/run-pnacl-sz.py
index 65eb22bf70c10436f9b2b7eba409240c6354ee48..ed320ee42d303052c4f42686b18a9e56df492aa2 100755
--- a/pydir/run-pnacl-sz.py
+++ b/pydir/run-pnacl-sz.py
@@ -112,7 +112,8 @@ def main():
       asm_temp.close()
     if args.assemble and args.filetype != 'obj':
       cmd += ['|', os.path.join(llvm_bin_path, 'llvm-mc'),
-              '-triple=i686-none-nacl',
+              # TODO(stichnot): use i686-nacl?
+              '-triple=i686',
               '-filetype=obj', '-o', asm_temp.name]
     elif asm_temp:
       cmd += ['-o', asm_temp.name]