message: Update LLDB for the FileManager API change
  Change LLDB's swift parts to work with the new FileManager API which now
  returns and ErrorOr<FileEntry*> instead of just the pointer.
diff: @@ -954,7 +954,7 @@ ClangExpressionParser::ParseInternal(DiagnosticManager &diagnostic_manager,
  auto file = m_compiler->getFileManager().getFile(temp_source_path);
  if (file) {
  source_mgr.setMainFileID(
  - source_mgr.createFileID(file, SourceLocation(), SrcMgr::C_User));
  + source_mgr.createFileID(*file, SourceLocation(), SrcMgr::C_User));
  created_main_file = true;
  }
  }
  