[clang] [LifetimeSafety] Detect use-after-invalidation for STL containers (PR #179093)

[Utkarsh Saxena via cfe-commits]

================
@@ -255,4 +255,76 @@ template <typename T> static bool isRecordWithAttr(QualType Type) {
 bool isGslPointerType(QualType QT) { return isRecordWithAttr<PointerAttr>(QT); }
 bool isGslOwnerType(QualType QT) { return isRecordWithAttr<OwnerAttr>(QT); }
 
+bool isContainerInvalidationMethod(const CXXMethodDecl *MD) {
+  if (!MD)
+    return false;
+  const CXXRecordDecl *RD = MD->getParent();
+  if (!RD || !isInStlNamespace(RD))
----------------
usx95 wrote:

Looks like never since `getParent` has a `cast`

```
const CXXRecordDecl *getParent() const {
    return cast<CXXRecordDecl>(FunctionDecl::getParent());
  }
```

Removed.

https://github.com/llvm/llvm-project/pull/179093