[clang] [BoundsSafety] Support bounds-safety attributes in type positions (PR #179612)

[Hans Wennborg via cfe-commits]

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@@ -19713,6 +19663,332 @@ bool Sema::EntirelyFunctionPointers(const RecordDecl *Record) {
   return llvm::all_of(Record->decls(), IsFunctionPointerOrForwardDecl);
 }
 
+static QualType handleCountedByAttrField(Sema &S, QualType T, Decl *D,
+                                         const ParsedAttr &AL) {
+  if (!AL.diagnoseLangOpts(S))
+    return QualType();
+
+  auto *FD = dyn_cast<FieldDecl>(D);
+  assert(FD);
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zmodem wrote:

nit: just `FD = cast<FieldDecl>(D)`

https://github.com/llvm/llvm-project/pull/179612