[clang] [Clang] Implement the 'counted_by' attribute (PR #76348)

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``````````bash
git-clang-format --diff 061e4f24b24a3b59d73a94dc6f2f0d21a2b7beac 557604301ab98d89b5ddf6d857d85326d7d3da3d -- clang/test/CodeGen/attr-counted-by.c clang/test/Sema/attr-counted-by.c clang/include/clang/AST/DeclBase.h clang/include/clang/Sema/Sema.h clang/include/clang/Sema/TypoCorrection.h clang/lib/AST/ASTImporter.cpp clang/lib/AST/DeclBase.cpp clang/lib/AST/Expr.cpp clang/lib/CodeGen/CGBuiltin.cpp clang/lib/CodeGen/CGExpr.cpp clang/lib/CodeGen/CodeGenFunction.h clang/lib/Sema/SemaDecl.cpp clang/lib/Sema/SemaDeclAttr.cpp clang/lib/Sema/SemaExpr.cpp clang/test/CodeGen/bounds-checking.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 836ccf3409..b8277b28a7 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -830,8 +830,8 @@ const FieldDecl *CodeGenFunction::FindFlexibleArrayMemberField(
     if (const auto *Field = dyn_cast<FieldDecl>(D);
         Field && (Name.empty() || Field->getNameAsString() == Name) &&
         Decl::isFlexibleArrayMemberLike(
-                     Ctx, Field, Field->getType(), StrictFlexArraysLevel,
-                     /*IgnoreTemplateOrMacroSubstitution=*/true)) {
+            Ctx, Field, Field->getType(), StrictFlexArraysLevel,
+            /*IgnoreTemplateOrMacroSubstitution=*/true)) {
       const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(RD);
       Offset += Layout.getFieldOffset(FieldNo);
       return Field;
@@ -970,7 +970,8 @@ CodeGenFunction::emitFlexibleArrayMemberSize(const Expr *E, unsigned Type,
     return nullptr;
 
   uint64_t Offset = 0;
-  const FieldDecl *FAMDecl = FindFlexibleArrayMemberField(Ctx, OuterRD, FAMName, Offset);
+  const FieldDecl *FAMDecl =
+      FindFlexibleArrayMemberField(Ctx, OuterRD, FAMName, Offset);
   Offset = Ctx.toCharUnitsFromBits(Offset).getQuantity();
 
   if (!FAMDecl || !FAMDecl->hasAttr<CountedByAttr>())

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https://github.com/llvm/llvm-project/pull/76348