message: [SwiftREPL] Initialize the request evaluator with the ASTContext.
  <rdar://problem/53519966>
diff: @@ -552,6 +552,7 @@ int SwiftREPL::CompleteCode(const std::string &current_code,
  if (swift_ast) {
  swift::ASTContext *ast = swift_ast->GetASTContext();
  + swift::registerIDERequestFunctions(ast->evaluator);
  swift::REPLCompletions completions;
  SourceModule completion_module_info;
  completion_module_info.path.push_back(ConstString("repl"));
  