[clang] [Clang] Add [[clang::complete_on_member_instantiation]] (PR #211231)

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/SemaCXX/attr-complete-on-member-instantiation.cpp clang/lib/Sema/SemaDeclAttr.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp --diff_from_common_commit
``````````

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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.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 59bc09e47..c061ba0ee 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -2071,7 +2071,8 @@ static void handleCommonAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   D->addAttr(::new (S.Context) CommonAttr(S.Context, AL));
 }
 
-static void handleCompleteOnMemberInstAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
+static void handleCompleteOnMemberInstAttr(Sema &S, Decl *D,
+                                           const ParsedAttr &AL) {
   if (!AL.hasParsedType()) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
     return;

``````````

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https://github.com/llvm/llvm-project/pull/211231