[LLDB] [lldb-server] Use llvm::InitLLVM for doing unicode conversion of arguments for windows

[mstorsjo]

Summary

This should allow lldb-server to operate on files with non-ascii pathnames.

I tried looking around in lldb/tools, and this seemed like the only other tool (other than the main lldb driver itself) that would be used (implicitly) by an end user (which could be working in non-ascii paths).

This does the same as for D68770 (where the main driver earlier was using custom code in the driver to convert unicode to utf8), while lldb-server didn't have any unicode handling at all before (where the main arguments would be given in the native local codepage, while the rest of llvm internals expect utf8).

lldb/tools/lldb-server/lldb-server.cpp

 //===-- lldb-server.cpp -----------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "SystemInitializerLLGS.h"
 #include "lldb/Initialization/SystemLifetimeManager.h"
 #include "lldb/lldb-private.h"
 
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Signals.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 
 static llvm::ManagedStatic<lldb_private::SystemLifetimeManager>
if (auto e = g_debugger_lifetime->Initialize(
     llvm::consumeError(std::move(e));
 }
 
 static void terminate_debugger() { g_debugger_lifetime->Terminate(); }
 } // namespace llgs
 
 // main
 int main(int argc, char *argv[]) {
+  llvm::InitLLVM IL(argc, argv);
   llvm::StringRef ToolName = argv[0];
   llvm::sys::PrintStackTraceOnErrorSignal(ToolName);
   llvm::PrettyStackTraceProgram X(argc, argv);
 
   int option_error = 0;
   const char *progname = argv[0];
   if (argc < 2) {
     display_usage(progname);