[Sanitizer] Adopt Python 3 for iOS simulator test scripts

[delcypher]

LGTM

compiler-rt/test/sanitizer_common/ios_commands/iossim_compile.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os, sys, subprocess
 
 output = None
 output_type = 'executable'
 
 args = sys.argv[1:]
 while args:
     arg = args.pop(0)
     if arg == '-shared':
         output_type = 'shared'
     elif arg == '-dynamiclib':
         output_type = 'dylib'
     elif arg == '-c':
         output_type = 'object'
     elif arg == '-S':
         output_type = 'assembly'
     elif arg == '-o':
         output = args.pop(0)
 
 if output == None:
-    print "No output file name!"
+    print("No output file name!")
     sys.exit(1)
 
 ret = subprocess.call(sys.argv[1:])
 if ret != 0:
     sys.exit(ret)
 
 # If we produce a dylib, ad-hoc sign it.
 if output_type in ['shared', 'dylib']:
     ret = subprocess.call(["codesign", "-s", "-", output])

compiler-rt/test/sanitizer_common/ios_commands/iossim_env.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os, sys, subprocess
 
 
 idx = 1
 for arg in sys.argv[1:]:
   if not "=" in arg:
     break
   idx += 1
   (argname, argval) = arg.split("=")
   os.environ["SIMCTL_CHILD_" + argname] = argval
 
 exitcode = subprocess.call(sys.argv[idx:])
 if exitcode > 125:
   exitcode = 126
 sys.exit(exitcode)

compiler-rt/test/sanitizer_common/ios_commands/iossim_prepare.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import json
 
 print(json.dumps({"env": {}}))

compiler-rt/test/sanitizer_common/ios_commands/iossim_run.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import glob, os, pipes, sys, subprocess
 
 
 device_id = os.environ.get('SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER')
 if not device_id:
   raise EnvironmentError("Specify SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER to select which simulator to use.")