[clangd] [Modules] Support Reusable Modules Builder

Author: ChuanqiXu9

clang-tools-extra/clangd/ClangdLSPServer.cpp

@@ -567,8 +567,8 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
               std::move(Mangler));
 
   if (Opts.EnableExperimentalModulesSupport) {
-    ModulesManager.emplace(*CDB);
-    Opts.ModulesManager = &*ModulesManager;
+    ModulesManager = ModulesBuilder::getModulesBuilder(*CDB);
+    Opts.ModulesManager = ModulesManager.get();
   }
 
   {

clang-tools-extra/clangd/ClangdLSPServer.h

@@ -327,7 +327,7 @@ class ClangdLSPServer : private ClangdServer::Callbacks,
   // The ClangdServer is created by the "initialize" LSP method.
   std::optional<ClangdServer> Server;
   // Manages to build module files.
-  std::optional<ModulesBuilder> ModulesManager;
+  std::unique_ptr<ModulesBuilder> ModulesManager;
 };
 } // namespace clangd
 } // namespace clang