Remove ASTContexts from SystemInitializerCommon

[labath]

Summary

The AST contexts are not needed in the server components, and the clang context in particular
pulls in large parts of clang into the binary. Simply removing these two calls reduces the
lldb-server size by about 50%--80%, depending on the architecture and build type.

This should not impact the client parts as the same calls are already present in
SystemInitializerFull.

[tberghammer]

Very nice!

I don't know how we missed this optimization before. Finally the size of lldb-server starts to became more reasonable (3.7 MB on arm32)

source/Initialization/SystemInitializerCommon.cpp

 //===-- SystemInitializerCommon.cpp -----------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Initialization/SystemInitializerCommon.h"
 
 #include "lldb/Host/Host.h"
 #include "lldb/Host/HostInfo.h"
 #include "lldb/Core/Log.h"
 #include "lldb/Core/Timer.h"
-#include "lldb/Symbol/GoASTContext.h"
-#include "lldb/Symbol/ClangASTContext.h"
 #include "Plugins/Instruction/ARM/EmulateInstructionARM.h"
 #include "Plugins/Instruction/MIPS/EmulateInstructionMIPS.h"
 #include "Plugins/Instruction/MIPS64/EmulateInstructionMIPS64.h"
 #include "Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.h"
 #include "Plugins/ObjectContainer/Universal-Mach-O/ObjectContainerUniversalMachO.h"
 #include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
 #include "Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h"
 #include "Plugins/Platform/Android/PlatformAndroid.h"
#endif
     HostInfo::Initialize();
     Timer scoped_timer(__PRETTY_FUNCTION__, __PRETTY_FUNCTION__);
 
     llvm::install_fatal_error_handler(fatal_error_handler, 0);
 
     process_gdb_remote::ProcessGDBRemoteLog::Initialize();
 
     // Initialize plug-ins
-    ClangASTContext::Initialize();
-    GoASTContext::Initialize();
-
     ObjectContainerBSDArchive::Initialize();
     ObjectFileELF::Initialize();
     ObjectFilePECOFF::Initialize();
     platform_freebsd::PlatformFreeBSD::Initialize();
     platform_linux::PlatformLinux::Initialize();
     platform_netbsd::PlatformNetBSD::Initialize();
     PlatformWindows::Initialize();
     PlatformKalimba::Initialize();
SystemInitializerCommon::Terminate()
     platform_netbsd::PlatformNetBSD::Terminate();
     PlatformWindows::Terminate();
     PlatformKalimba::Terminate();
     platform_android::PlatformAndroid::Terminate();
     ObjectContainerUniversalMachO::Terminate();
     PlatformMacOSX::Terminate();
     PlatformRemoteiOS::Terminate();
 
-    ClangASTContext::Terminate();
-    GoASTContext::Terminate();
-
     EmulateInstructionARM::Terminate();
     EmulateInstructionMIPS::Terminate();
     EmulateInstructionMIPS64::Terminate();
 
 #if defined(__APPLE__)
     PlatformiOSSimulator::Terminate();
     ObjectFileMachO::Terminate();
     PlatformDarwinKernel::Terminate();