[clang] [C++20] [Modules] Warn if we found #include <filename> in module purview (PR #69555)

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

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``````````bash
git-clang-format --diff b858309ddc977d5e70de54f3fa3888915b5fbc0c 49ead327fec98f5276a9667414668a05fb03c705 -- clang/lib/Lex/PPDirectives.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index 93b05c3443e5..85cc7b364205 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -2532,7 +2532,7 @@ Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
 
   if (isAngled && isInNamedModule())
     Diag(FilenameTok, diag::warn_pp_include_angled_in_module_purview)
-      << getNamedModuleName();
+        << getNamedModuleName();
 
   // Look up the file, create a File ID for it.
   SourceLocation IncludePos = FilenameTok.getLocation();

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https://github.com/llvm/llvm-project/pull/69555