[clang] [C++20][Modules] Allow using stdarg.h with header units (PR #100739)

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github-actions[bot] wrote:

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


:warning: C/C++ code formatter, clang-format found issues in your code. 
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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff 38d0b2d174efe05504a18988299b4d78d37999b7 
edc7f5c84caefeae197a5884c91ec2194fd3148b --extensions cpp -- 
clang/test/Headers/stdarg-cxx-modules.cpp clang/lib/Serialization/ASTReader.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Serialization/ASTReader.cpp 
b/clang/lib/Serialization/ASTReader.cpp
index f3e8027526..76f08e4fe7 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -1051,7 +1051,8 @@ IdentifierID 
ASTIdentifierLookupTrait::ReadIdentifierID(const unsigned char *d)
   return Reader.getGlobalIdentifierID(F, RawID >> 1);
 }
 
-static void markIdentifierFromAST(ASTReader &Reader, IdentifierInfo &II, bool 
IsModule) {
+static void markIdentifierFromAST(ASTReader &Reader, IdentifierInfo &II,
+                                  bool IsModule) {
   if (!II.isFromAST()) {
     II.setIsFromAST();
     if (isInterestingIdentifier(Reader, II, IsModule))
@@ -1079,7 +1080,8 @@ IdentifierInfo *ASTIdentifierLookupTrait::ReadData(const 
internal_key_type& k,
     II = &Reader.getIdentifierTable().getOwn(k);
     KnownII = II;
   }
-  markIdentifierFromAST(Reader, *II, 
Reader.getPreprocessor().getCurrentModule() != nullptr);
+  markIdentifierFromAST(Reader, *II,
+                        Reader.getPreprocessor().getCurrentModule() != 
nullptr);
   Reader.markIdentifierUpToDate(II);
 
   IdentifierID ID = Reader.getGlobalIdentifierID(F, RawID);
@@ -8960,7 +8962,8 @@ IdentifierInfo 
*ASTReader::DecodeIdentifierInfo(IdentifierID ID) {
     auto Key = Trait.ReadKey(Data, KeyDataLen.first);
     auto &II = PP.getIdentifierTable().get(Key);
     IdentifiersLoaded[Index] = &II;
-    markIdentifierFromAST(*this,  II, getPreprocessor().getCurrentModule() != 
nullptr);
+    markIdentifierFromAST(*this, II,
+                          getPreprocessor().getCurrentModule() != nullptr);
     if (DeserializationListener)
       DeserializationListener->IdentifierRead(ID, &II);
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/100739
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