[clang] [WIP][clang] Detect when headers are added to umbrella modules (PR #202367)

[via cfe-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions h,c,cpp -- clang/test/Modules/validate-umbrella-dir.c clang/include/clang/Lex/HeaderSearchOptions.h clang/include/clang/Lex/ModuleMap.h clang/include/clang/Serialization/ASTReader.h clang/lib/Frontend/FrontendAction.cpp clang/lib/Lex/ModuleMap.cpp clang/lib/Lex/PPLexerChange.cpp clang/lib/Serialization/ASTReader.cpp --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/clang/include/clang/Lex/HeaderSearchOptions.h b/clang/include/clang/Lex/HeaderSearchOptions.h
index 8baa14607..b59b46bed 100644
--- a/clang/include/clang/Lex/HeaderSearchOptions.h
+++ b/clang/include/clang/Lex/HeaderSearchOptions.h
@@ -304,8 +304,7 @@ public:
         ModulesValidateOncePerBuildSession(false),
         ModulesValidateSystemHeaders(false),
         ModulesForceValidateUserHeaders(true),
-        ModulesValidateUmbrellaDirs(false),
-        ValidateASTInputFilesContent(false),
+        ModulesValidateUmbrellaDirs(false), ValidateASTInputFilesContent(false),
         ForceCheckCXX20ModulesInputFiles(false), UseDebugInfo(false),
         ModulesValidateDiagnosticOptions(true),
         ModulesSkipDiagnosticOptions(false),

``````````

</details>


https://github.com/llvm/llvm-project/pull/202367