Disable Subzero IR generation for performance testing.

tests_lit/lit.cfg

 # -*- Python -*-
 # Taken from utils/lit/tests in the LLVM tree and hacked together to support
 # our tests.
 #
 # Note: This configuration has simple commands to run Subzero's translator.
 # They have the form %X2i (i.e. %p2i, %l2i, and %lc2i) where X is defined
 # as follows:
 #
 #   p : Run Subzero's translator, building ICE from PNaCl bitcode directly.
 #   l : Run Subzero's translator, converting the .ll file to a PNaCl bitcode
@@ skipping 62 matching lines @@
 
 # Add build attributes of llvm2ice tool to the set of available features.
 config.available_features.update(llvm2iceatts)
 
 def if_cond_flag(Value):
   return '--cond=true' if Value else '--cond=false'
 
 # shell conditional commands.
 if_atts = [os.path.join(pydir, 'if.py')]
 if_atts_cmd = if_atts + ['--have=' + att
-                         for att in llvm2iceatts] + ['--command']
+                         for att in llvm2iceatts]
 ifl2i_atts_cmd = if_atts + [if_cond_flag('allow_llvm_ir' in llvm2iceatts),
                             '--command']
 iflc2i_atts_cmd = if_atts + [if_cond_flag('allow_llvm_ir_as_input'
                                           in llvm2iceatts), '--command']
 
 # Base command for running llvm2ice
 llvm2ice_cmd = [os.path.join(pydir, 'run-llvm2ice.py'),
                 '--llvm2ice', llvm2icetool,
                 '--llvm-bin-path', llvmbinpath]
 
@@ skipping 32 matching lines @@
 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)
 dbg("Build attributes = %s" % llvm2iceatts)