Remove platform plugins from lldb-server

Summary:
This removes the last usage of Platform plugins in lldb-server -- it was used for launching child
processes, where it can be trivially replaced by Host::LaunchProces (as lldb-server is always
running on the host).

Removing platform plugins enables us to remove a lot of other unused code, which was pulled in as
a transitive dependency, and it reduces lldb-server size by 4%--9% (depending on build type and
architecture).

Reviewers: clayborg

Subscribers: tberghammer, danalbert, srhines, lldb-commits

Differential Revision: http://reviews.llvm.org/D20440

llvm-svn: 274125
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
index 066e498..caf6eb3 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
@@ -40,7 +40,7 @@
     //------------------------------------------------------------------
     // Constructors and Destructors
     //------------------------------------------------------------------
-    GDBRemoteCommunicationServerLLGS(const lldb::PlatformSP& platform_sp, MainLoop &mainloop);
+    GDBRemoteCommunicationServerLLGS(MainLoop &mainloop);
 
     //------------------------------------------------------------------
     /// Specify the program to launch and its arguments.
@@ -114,7 +114,6 @@
     InitializeConnection (std::unique_ptr<Connection> &&connection);
 
 protected:
-    lldb::PlatformSP m_platform_sp;
     MainLoop &m_mainloop;
     MainLoop::ReadHandleUP m_network_handle_up;
     lldb::tid_t m_current_tid;