[clang] [Modules] [HeaderSearch] Don't reenter headers if it is pragma once (PR #76119)

[Chuanqi Xu via cfe-commits]

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@@ -1458,7 +1458,7 @@ bool HeaderSearch::ShouldEnterIncludeFile(Preprocessor &PP,
   } else {
     // Otherwise, if this is a #include of a file that was previously #import'd
     // or if this is the second #include of a #pragma once file, ignore it.
-    if ((FileInfo.isPragmaOnce || FileInfo.isImport) && !TryEnterImported())
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ChuanqiXu9 wrote:

I feel it will become harder to read. So I didn't inline it. But I move the definition to a closer place.

https://github.com/llvm/llvm-project/pull/76119