[Modules] [HeaderSearch] Don't reenter headers if it is pragma once (#76119) Close https://github.com/llvm/llvm-project/issues/73023 The direct issue of https://github.com/llvm/llvm-project/issues/73023 is that we entered a header which is marked as pragma once since the compiler think it is OK if there is controlling macro. It doesn't make sense. I feel like it should be sufficient to skip it after we see the '#pragma once'. From the context, it looks like the workaround is primarily for ObjectiveC. So we might need reviewers from OC.
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