[clang] [C++20][Modules][Serialization] Delay marking pending incomplete decl chains until the end of `finishPendingActions`. (PR #121245)

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


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``````````bash
git-clang-format --diff d4159e2a1d1d640077b2e5cde66b0a284049955f d48f483b66e30d0ca8df41bb3e9da5137abeec37 --extensions cpp -- clang/test/Modules/pr121245.cpp clang/lib/Serialization/ASTReader.cpp
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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 83bcd5bfab..24acd6e297 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -10479,7 +10479,7 @@ void ASTReader::finishPendingActions() {
 
   // For each decl chain that we wanted to complete while deserializing, mark
   // it as "still needs to be completed".
-  for (Decl* D : PendingIncompleteDeclChains)
+  for (Decl *D : PendingIncompleteDeclChains)
     markIncompleteDeclChain(D);
   PendingIncompleteDeclChains.clear();
 }

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https://github.com/llvm/llvm-project/pull/121245