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

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

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

Reviewed By: serge-sans-paille

Differential Revision: https://reviews.llvm.org/D150410

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

@@ -3,18 +3,10 @@
 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:
@@ -182,7 +174,7 @@ if platform.system() == 'Windows':
 # 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):

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

@@ -6,21 +6,13 @@
 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
@@ -730,15 +722,15 @@ 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())
     ))
   )
 

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

@@ -6,15 +6,6 @@ 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: