[clang] [Clang][counted_by] Add support for 'counted_by' on struct pointers (PR #127116)

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


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 72f4e656b8feb3665bd074fadf1db1e72b385030 b5b9b158e7e379f2d430584e3ccf519677bf27a3 --extensions c,h,cpp -- clang/test/CodeGen/attr-counted-by-for-pointers.c clang/lib/CodeGen/CGBuiltin.cpp clang/lib/CodeGen/CGExpr.cpp clang/lib/CodeGen/CodeGenFunction.h
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 876eb06772..d2a90c0ddf 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -4273,7 +4273,8 @@ void CodeGenFunction::EmitCountedByBoundsChecking(
   if (!CountFD)
     return;
 
-  if (std::optional<int64_t> Diff = getOffsetDifferenceInBits(*this, CountFD, FD)) {
+  if (std::optional<int64_t> Diff =
+          getOffsetDifferenceInBits(*this, CountFD, FD)) {
     // FIXME: The 'static_cast' is necessary, otherwise the result turns into a
     // uint64_t, which messes things up if we have a negative offset difference.
     Diff = *Diff / static_cast<int64_t>(CGM.getContext().getCharWidth());
@@ -4283,9 +4284,9 @@ void CodeGenFunction::EmitCountedByBoundsChecking(
     Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, Int8PtrTy, Int8Ty);
 
     llvm::Type *CountTy = ConvertType(CountFD->getType());
-    llvm::Value *Res = Builder.CreateInBoundsGEP(
-        Int8Ty, Addr.emitRawPointer(*this),
-        Builder.getInt32(*Diff), ".counted_by.gep");
+    llvm::Value *Res =
+        Builder.CreateInBoundsGEP(Int8Ty, Addr.emitRawPointer(*this),
+                                  Builder.getInt32(*Diff), ".counted_by.gep");
     Res = Builder.CreateAlignedLoad(CountTy, Res, getIntAlign(),
                                     ".counted_by.load");
 

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https://github.com/llvm/llvm-project/pull/127116