message: [SystemInitializeCommon] Remove unneded ClangASTContext init.
  Alex already removed this upstream, but the code has been merged
  incorrectly.
diff: #include "lldb/Host/FileSystem.h"
  #include "lldb/Host/Host.h"
  #include "lldb/Host/HostInfo.h"
  -#include "lldb/Symbol/ClangASTContext.h"
  #include "lldb/Host/Socket.h"
  #include "lldb/Utility/Log.h"
  #include "lldb/Utility/Reproducer.h"
  @@ -98,8 +97,6 @@ llvm::Error SystemInitializerCommon::Initialize() {
  process_gdb_remote::ProcessGDBRemoteLog::Initialize();
  // Initialize plug-ins
  - ClangASTContext::Initialize();
  -
  #if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
  ProcessPOSIXLog::Initialize();
  #endif
  @@ -114,8 +111,6 @@ void SystemInitializerCommon::Terminate() {
  static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
  Timer scoped_timer(func_cat, LLVM_PRETTY_FUNCTION);
  - ClangASTContext::Terminate();
  -
  #if defined(_WIN32)
  ProcessWindowsLog::Terminate();
  #endif
  