Disable Subzero IR generation for performance testing.

pydir/run-llvm2ice.py

 #!/usr/bin/env python2
 
 import argparse
 import itertools
 import os
 import re
 import subprocess
 import sys
 
 from utils import shellcmd
@@ skipping 29 matching lines @@
         '--llvm2ice', required=False, default='./llvm2ice', metavar='LLVM2ICE',
         help="Subzero translator 'llvm2ice'")
     argparser.add_argument('--llvm-bin-path', required=False,
                            default=None, metavar='LLVM_BIN_PATH',
                            help='Path to LLVM executables ' +
                                 '(for building PEXE files)')
     argparser.add_argument('--echo-cmd', required=False,
                            action='store_true',
                            help='Trace command that generates ICE instructions')
     argparser.add_argument('--args', '-a', nargs=argparse.REMAINDER,
+                           default=[],
                            help='Remaining arguments are passed to llvm2ice')
 
     args = argparser.parse_args()
     llvm_bin_path = args.llvm_bin_path
     llfile = args.input
 
     if args.llvm and args.llvm_source:
       raise RuntimeError("Can't specify both '--llvm' and '--llvm-source'")
 
     if args.llvm_source and args.no_local_syms:
@@ skipping 11 matching lines @@
     if args.insts:
       cmd += ['-verbose', 'inst', '-notranslate']
     if not args.llvm_source:
       cmd += ['--bitcode-format=pnacl']
       if not args.no_local_syms:
         cmd += ['--allow-local-symbol-tables']
     if args.llvm or args.llvm_source:
       cmd += ['--build-on-read=0']
     else:
       cmd += ['--build-on-read=1']
-    if args.args:
-      cmd += args.args
+    cmd += args.args
     if args.llvm_source:
       cmd += [llfile]
 
     stdout_result = shellcmd(cmd, echo=args.echo_cmd)
     if not args.echo_cmd:
       sys.stdout.write(stdout_result)
 
 if __name__ == '__main__':
     main()