Modify pnacl subzero to be able to read pnacl bitcode files.

tests_lit/lit.cfg

 # Taken from utils/lit/tests in the LLVM tree and hacked together to support
 # our tests.
 
 # -*- Python -*-
 
 import os
 import sys
 
 import lit.formats
 
@@ skipping 14 matching lines @@
 src_root = os.path.abspath(os.path.join(config.test_source_root, '..'))
 bin_root = src_root
 config.substitutions.append(('%{src_root}', src_root))
 config.substitutions.append(('%{python}', sys.executable))
 
 # Finding LLVM binary tools. All tools used in the tests must be listed in
 # the llvmbintools list.
 llvmbinpath = os.path.abspath(os.environ.get('LLVM_BIN_PATH'))
 
 # Finding Subzero tools
-config.substitutions.append(('%llvm2ice', os.path.join(bin_root, 'llvm2ice')))
+llvm2icetool = os.path.join(bin_root, 'llvm2ice')
+config.substitutions.append(
+  ('%llvm2iceinsts', ' '.join([os.path.join(bin_root, 'llvm2iceinsts.py'),
+                               '--llvm2ice', llvm2icetool,
+                               '--llvm-bin-path', llvmbinpath
+                             ])))
+config.substitutions.append(('%llvm2ice', llvm2icetool))
 config.substitutions.append(('%szdiff', os.path.join(bin_root, 'szdiff.py')))
 
 llvmbintools = ['FileCheck']
 
 for tool in llvmbintools:
   config.substitutions.append((tool, os.path.join(llvmbinpath, tool)))
 
 # Add a feature to detect the Python version.
 config.available_features.add("python%d.%d" % (sys.version_info[0],
                                                sys.version_info[1]))
 
 # Debugging output
 def dbg(s):
   print '[DBG] %s' % s
 
 dbg('bin_root = %s' % bin_root)
 dbg('llvmbinpath = %s' % llvmbinpath)