[clang] [TBAA] Skip all bitfields when generating !tbaa.struct metadata. (PR #82922)

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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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<summary>
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``````````bash
git-clang-format --diff 8c5e9cf737138aba22a4a8f64ef2c5efc80dd7f9 32be3b7d944fc5da50add4b6fea551ba6c9d428c -- clang/lib/CodeGen/CodeGenModule.cpp clang/lib/CodeGen/CodeGenTBAA.cpp clang/lib/CodeGen/CodeGenTBAA.h clang/test/CodeGen/tbaa-struct.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index ed8db05572..11b407e2b1 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -397,8 +397,8 @@ CodeGenModule::CodeGenModule(ASTContext &C,
   // Enable TBAA unless it's suppressed. ThreadSanitizer needs TBAA even at O0.
   if (LangOpts.Sanitize.has(SanitizerKind::Thread) ||
       (!CodeGenOpts.RelaxedAliasing && CodeGenOpts.OptimizationLevel > 0))
-    TBAA.reset(new CodeGenTBAA(Context, getTypes(), TheModule, CodeGenOpts, getLangOpts(),
-                               getCXXABI().getMangleContext()));
+    TBAA.reset(new CodeGenTBAA(Context, getTypes(), TheModule, CodeGenOpts,
+                               getLangOpts(), getCXXABI().getMangleContext()));
 
   // If debug info or coverage generation is enabled, create the CGDebugInfo
   // object.
diff --git a/clang/lib/CodeGen/CodeGenTBAA.cpp b/clang/lib/CodeGen/CodeGenTBAA.cpp
index 6a453bb114..5793e0df33 100644
--- a/clang/lib/CodeGen/CodeGenTBAA.cpp
+++ b/clang/lib/CodeGen/CodeGenTBAA.cpp
@@ -14,9 +14,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "CodeGenTBAA.h"
 #include "CGRecordLayout.h"
 #include "CodeGenTypes.h"
-#include "CodeGenTBAA.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/Mangle.h"
@@ -31,13 +31,12 @@
 using namespace clang;
 using namespace CodeGen;
 
-CodeGenTBAA::CodeGenTBAA(ASTContext &Ctx, CodeGenTypes &CGTypes, llvm::Module &M,
-                         const CodeGenOptions &CGO,
+CodeGenTBAA::CodeGenTBAA(ASTContext &Ctx, CodeGenTypes &CGTypes,
+                         llvm::Module &M, const CodeGenOptions &CGO,
                          const LangOptions &Features, MangleContext &MContext)
-  : Context(Ctx), CGTypes(CGTypes), Module(M), CodeGenOpts(CGO),
-    Features(Features), MContext(MContext), MDHelper(M.getContext()),
-    Root(nullptr), Char(nullptr)
-{}
+    : Context(Ctx), CGTypes(CGTypes), Module(M), CodeGenOpts(CGO),
+      Features(Features), MContext(MContext), MDHelper(M.getContext()),
+      Root(nullptr), Char(nullptr) {}
 
 CodeGenTBAA::~CodeGenTBAA() {
 }
@@ -316,17 +315,18 @@ CodeGenTBAA::CollectFields(uint64_t BaseOffset,
           j++;
         }
         uint64_t Offset = BaseOffset;
-        uint64_t Size = llvm::divideCeil(CurrentBitFieldSize , 8);
+        uint64_t Size = llvm::divideCeil(CurrentBitFieldSize, 8);
         llvm::MDNode *TBAAType = getChar();
-        llvm::MDNode *TBAATag = getAccessTagInfo(TBAAAccessInfo(TBAAType, Size));
-        Fields.push_back(llvm::MDBuilder::TBAAStructField(Offset, Size, TBAATag));
+        llvm::MDNode *TBAATag =
+            getAccessTagInfo(TBAAAccessInfo(TBAAType, Size));
+        Fields.push_back(
+            llvm::MDBuilder::TBAAStructField(Offset, Size, TBAATag));
         i = std::prev(j);
       } else {
         if (!CollectFields(Offset, FieldQTy, Fields,
                            MayAlias || TypeHasMayAlias(FieldQTy)))
           return false;
-
-        }
+      }
     }
     return true;
   }
diff --git a/clang/lib/CodeGen/CodeGenTBAA.h b/clang/lib/CodeGen/CodeGenTBAA.h
index 7e315c285b..aa6da2731a 100644
--- a/clang/lib/CodeGen/CodeGenTBAA.h
+++ b/clang/lib/CodeGen/CodeGenTBAA.h
@@ -29,7 +29,7 @@ namespace clang {
   class Type;
 
 namespace CodeGen {
-  class CodeGenTypes;
+class CodeGenTypes;
 
 // TBAAAccessKind - A kind of TBAA memory access descriptor.
 enum class TBAAAccessKind : unsigned {
@@ -169,8 +169,9 @@ class CodeGenTBAA {
   llvm::MDNode *getBaseTypeInfoHelper(const Type *Ty);
 
 public:
-  CodeGenTBAA(ASTContext &Ctx, CodeGenTypes &CGTypes, llvm::Module &M, const CodeGenOptions &CGO,
-              const LangOptions &Features, MangleContext &MContext);
+  CodeGenTBAA(ASTContext &Ctx, CodeGenTypes &CGTypes, llvm::Module &M,
+              const CodeGenOptions &CGO, const LangOptions &Features,
+              MangleContext &MContext);
   ~CodeGenTBAA();
 
   /// getTypeInfo - Get metadata used to describe accesses to objects of the

``````````

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https://github.com/llvm/llvm-project/pull/82922