[clang] [clang] Add -Wmissing-designated-field-initializers (PR #81364)

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``````````bash
git-clang-format --diff 5dc9e87c8cae7842edcaa4dd01308873109208da fa70ace81c2311636ce369259aded2b8f40ad0d6 -- clang/lib/Sema/SemaInit.cpp clang/test/SemaCXX/cxx2a-initializer-aggregates.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index e44752bb03..bb8748f443 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -2358,7 +2358,8 @@ void InitListChecker::CheckStructUnionTypes(
   // Emit warnings for missing struct field initializers.
   // This check is disabled for designated initializers in C.
   // This matches gcc behaviour.
-  bool IsCDesignatedInitializer = HasDesignatedInit && !SemaRef.getLangOpts().CPlusPlus;
+  bool IsCDesignatedInitializer =
+      HasDesignatedInit && !SemaRef.getLangOpts().CPlusPlus;
   if (!VerifyOnly && InitializedSomething && !RD->isUnion() &&
       !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) &&
       !IsCDesignatedInitializer) {

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https://github.com/llvm/llvm-project/pull/81364