[clang-tools-extra] [clangd] [C++20] [Modules] Introduce initial support for C++20 Modules (PR #66462)

[Chuanqi Xu via cfe-commits]

================
@@ -696,6 +698,19 @@ buildPreamble(PathRef FileName, CompilerInvocation CI,
     Result->Includes = CapturedInfo.takeIncludes();
     Result->Pragmas = std::make_shared<const include_cleaner::PragmaIncludes>(
         CapturedInfo.takePragmaIncludes());
+
+    if (ExperimentalModulesSupport) {
+      WallTimer PrerequisiteModuleTimer;
+      PrerequisiteModuleTimer.startTimer();
+      Result->DependentModulesInfo =
+          PrerequisiteModules::buildPrerequisiteModulesFor(FileName, 
Inputs.TFS,
+                                                           CDB);
+      PrerequisiteModuleTimer.stopTimer();
+
+      log("Built prerequisite module for file {0} in {1} seconds", FileName,
----------------
ChuanqiXu9 wrote:

Done

https://github.com/llvm/llvm-project/pull/66462
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