[lldb] Remove legacy six module for py2->py3

LLDB only supports Python3 now, so the `six` shim for Python2 is no longer necessary.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D142140

lldb/bindings/python/CMakeLists.txt

@@ -60,13 +60,6 @@ function(finish_swig_python swig_target lldb_python_bindings_dir lldb_python_tar
     DEPENDS ${lldb_python_bindings_dir}/lldb.py
     COMMENT "Python script sym-linking LLDB Python API")
 
-  if(NOT LLDB_USE_SYSTEM_SIX)
-    add_custom_command(TARGET ${swig_target} POST_BUILD VERBATIM
-      COMMAND ${CMAKE_COMMAND} -E copy
-        "${LLDB_SOURCE_DIR}/third_party/Python/module/six/six.py"
-        "${lldb_python_target_dir}/../six.py")
-  endif()
-
   add_custom_command(TARGET ${swig_target} POST_BUILD VERBATIM
     COMMAND ${CMAKE_COMMAND} -E copy
       "${lldb_python_bindings_dir}/lldb.py"

lldb/cmake/modules/LLDBConfig.cmake

@@ -65,7 +65,6 @@ add_optional_dependency(LLDB_ENABLE_PYTHON "Enable Python scripting support in L
 add_optional_dependency(LLDB_ENABLE_LIBXML2 "Enable Libxml 2 support in LLDB" LibXml2 LIBXML2_FOUND VERSION 2.8)
 add_optional_dependency(LLDB_ENABLE_FBSDVMCORE "Enable libfbsdvmcore support in LLDB" FBSDVMCore FBSDVMCore_FOUND QUIET)
 
-option(LLDB_USE_SYSTEM_SIX "Use six.py shipped with system and do not install a copy of it" OFF)
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)
 option(LLDB_BUILD_FRAMEWORK "Build LLDB.framework (Darwin only)" OFF)
 option(LLDB_NO_INSTALL_DEFAULT_RPATH "Disable default RPATH settings in binaries" OFF)