[clang] Fix null-deref thanks to an attribute on a global declarator chunk (PR #83611)

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


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``````````bash
git-clang-format --diff 601a9587a1a7eb8dd6377c4ab332edd3bce97a98 8152ad56b320719553701edf020c30aea8c3213e -- clang/test/Parser/cxx-declarator-attribute-crash.cpp clang/include/clang/Sema/DeclSpec.h clang/include/clang/Sema/ParsedAttr.h clang/lib/Parse/ParseDecl.cpp clang/lib/Sema/ParsedAttr.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/ParsedAttr.cpp b/clang/lib/Sema/ParsedAttr.cpp
index 978d4e7bf4..6abc90336c 100644
--- a/clang/lib/Sema/ParsedAttr.cpp
+++ b/clang/lib/Sema/ParsedAttr.cpp
@@ -101,9 +101,9 @@ void AttributePool::takePool(AttributePool &pool) {
 }
 
 void AttributePool::takeFrom(ParsedAttributesView &List, AttributePool &Pool) {
-    assert(&Pool != this && "AttributePool can't take attributes from itself");
-    llvm::for_each(List.AttrList, [&Pool](ParsedAttr *A) { Pool.remove(A); });
-    Attrs.insert(Attrs.end(), List.AttrList.begin(), List.AttrList.end());
+  assert(&Pool != this && "AttributePool can't take attributes from itself");
+  llvm::for_each(List.AttrList, [&Pool](ParsedAttr *A) { Pool.remove(A); });
+  Attrs.insert(Attrs.end(), List.AttrList.begin(), List.AttrList.end());
 }
 
 namespace {

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https://github.com/llvm/llvm-project/pull/83611