[test] Remove Python<3.3 workaround without shlex.quote

[MaskRay]

Summary

Python>=3.6 has been the requirement since D93097 (2020).
Remove old workarounds.

Remove unused imports from compiler-rt/test/memprof/lit.cfg.py

[serge-sans-paille]

Good catch!

compiler-rt/test/asan/lit.cfg.py

 # -*- Python -*-
 
 import os
 import platform
 import re
+import shlex
 
 import lit.formats
 
-# Get shlex.quote if available (added in 3.3), and fall back to pipes.quote if
-# it's not available.
-try:
-  import shlex
-  sh_quote = shlex.quote
-except:
-  import pipes
-  sh_quote = pipes.quote
-
 def get_required_attr(config, attr_name):
   attr_value = getattr(config, attr_name, None)
   if attr_value == None:
     lit_config.fatal(
       "No attribute %r in test configuration! You may need to run "
       "tests from your build directory or add this attribute "
       "to lit.site.cfg.py " % attr_name)
   return attr_value
else:
     config.substitutions.append( ("%clang_cl ", build_invocation(target_cxxflags)) )
     config.substitutions.append( ("%clang_cl_asan ", build_invocation(clang_asan_cxxflags)) )
     config.substitutions.append( ("%Od", "-O0") )
     config.substitutions.append( ("%Fe", "-o") )
 
 # FIXME: De-hardcode this path.
 asan_source_dir = os.path.join(
   get_required_attr(config, "compiler_rt_src_root"), "lib", "asan")
-python_exec = sh_quote(get_required_attr(config, "python_executable"))
+python_exec = shlex.quote(get_required_attr(config, "python_executable"))
 # Setup path to asan_symbolize.py script.
 asan_symbolize = os.path.join(asan_source_dir, "scripts", "asan_symbolize.py")
 if not os.path.exists(asan_symbolize):
   lit_config.fatal("Can't find script on path %r" % asan_symbolize)
 config.substitutions.append( ("%asan_symbolize", python_exec + " " + asan_symbolize + " ") )
 # Setup path to sancov.py script.
 sanitizer_common_source_dir = os.path.join(
   get_required_attr(config, "compiler_rt_src_root"), "lib", "sanitizer_common")

compiler-rt/test/lit.common.cfg.py

 # -*- Python -*-
 
 # Configuration file for 'lit' test runner.
 # This file contains common rules for various compiler-rt testsuites.
 # It is mostly copied from lit.cfg.py used by Clang.
 import os
 import platform
 import re
+import shlex
 import subprocess
 import json
 
 import lit.formats
 import lit.util
 
-# Get shlex.quote if available (added in 3.3), and fall back to pipes.quote if
-# it's not available.
-try:
-  import shlex
-  sh_quote = shlex.quote
-except:
-  import pipes
-  sh_quote = pipes.quote
-
 def find_compiler_libdir():
   """
     Returns the path to library resource directory used
     by the compiler.
   """
   if config.compiler_id != 'Clang':
     lit_config.warning(f'Determining compiler\'s runtime directory is not supported for {config.compiler_id}')
     # TODO: Support other compilers.

 
 config.clang = " " + " ".join(run_wrapper + [config.compile_wrapper, config.clang]) + " "
 config.target_cflags = " " + " ".join(target_cflags + extra_cflags) + " "
 
 if config.host_os == 'Darwin':
   config.substitutions.append((
     "%get_pid_from_output",
     "{} {}/get_pid_from_output.py".format(
-      sh_quote(config.python_executable),
-      sh_quote(get_ios_commands_dir())
+      shlex.quote(config.python_executable),
+      shlex.quote(get_ios_commands_dir())
     ))
   )
   config.substitutions.append(
     ("%print_crashreport_for_pid",
     "{} {}/print_crashreport_for_pid.py".format(
-      sh_quote(config.python_executable),
-      sh_quote(get_ios_commands_dir())
+      shlex.quote(config.python_executable),
+      shlex.quote(get_ios_commands_dir())
     ))
   )
 
 # It is not realistically possible to account for all options that could
 # possibly be present in system and user configuration files, so disable
 # default configs for the test runs. In particular, anything hardening
 # related is likely to cause issues with sanitizer tests, because it may
 # preempt something we're looking to trap (e.g. _FORTIFY_SOURCE vs our ASAN).
 config.environment["CLANG_NO_DEFAULT_CONFIG"] = "1"

compiler-rt/test/memprof/lit.cfg.py

 # -*- Python -*-
 
 import os
 import platform
 import re
 
 import lit.formats
 
-# Get shlex.quote if available (added in 3.3), and fall back to pipes.quote if
-# it's not available.
-try:
-  import shlex
-  sh_quote = shlex.quote
-except:
-  import pipes
-  sh_quote = pipes.quote
-
 def get_required_attr(config, attr_name):
   attr_value = getattr(config, attr_name, None)
   if attr_value == None:
     lit_config.fatal(
       "No attribute %r in test configuration! You may need to run "
       "tests from your build directory or add this attribute "
       "to lit.site.cfg.py " % attr_name)
   return attr_value