[clang] [clang-tools-extra] Add code completion for C++20 keywords. (PR #107982)

[via cfe-commits]

================
@@ -2186,6 +2197,45 @@ AddOrdinaryNameResults(SemaCodeCompletion::ParserCompletionContext CCC,
       } else {
         Results.AddResult(Result("template", CodeCompletionResult::RK_Keyword));
       }
+
+      if (SemaRef.getLangOpts().CPlusPlus20 &&
+          SemaRef.getLangOpts().CPlusPlusModules) {
+        // export
+        Results.AddResult(Result("export", CodeCompletionResult::RK_Keyword));
+
+        if (SemaRef.CurContext->isTranslationUnit()) {
----------------
cor3ntin wrote:

It only happens during completion so there is probably a bug with that https://godbolt.org/z/7M8EPodoP

https://github.com/llvm/llvm-project/pull/107982