Move PseudoTerminal to the lldb_private namespace

lldb_utility doesn't make sense, as it is no longer even living in the
"utility" module.

llvm-svn: 320346
diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
index 5b2d084..35d02c1 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -817,7 +817,7 @@
   if (object_file) {
     error = EstablishConnectionIfNeeded(launch_info);
     if (error.Success()) {
-      lldb_utility::PseudoTerminal pty;
+      PseudoTerminal pty;
       const bool disable_stdio = (launch_flags & eLaunchFlagDisableSTDIO) != 0;
 
       PlatformSP platform_sp(GetTarget().GetPlatform());
@@ -946,8 +946,7 @@
         SetPrivateState(SetThreadStopInfo(response));
 
         if (!disable_stdio) {
-          if (pty.GetMasterFileDescriptor() !=
-              lldb_utility::PseudoTerminal::invalid_fd)
+          if (pty.GetMasterFileDescriptor() != PseudoTerminal::invalid_fd)
             SetSTDIOFileDescriptor(pty.ReleaseMasterFileDescriptor());
         }
       }