[clang] [C++20][Modules] Allow import for a header unit after #pragma (PR #111662)

[Chuanqi Xu via cfe-commits]

================
@@ -951,9 +951,16 @@ void Preprocessor::Lex(Token &Result) {
         break;
       [[fallthrough]];
     default:
-      TrackGMFState.handleMisc();
-      StdCXXImportSeqState.handleMisc();
-      ModuleDeclState.handleMisc();
+      if (tok::isPragmaAnnotation(Result.getKind())) {
----------------
ChuanqiXu9 wrote:

This is slightly hack. Let's add a new case for it and maybe we need to update 
the state machine if required.

https://github.com/llvm/llvm-project/pull/111662
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