[clang] [clang] Implement -Walloc-size diagnostic option (PR #150028)

[Erich Keane via cfe-commits]

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@@ -3256,6 +3257,14 @@ class CallExpr : public Expr {
     setDependence(getDependence() | ExprDependence::TypeValueInstantiation);
   }
 
+  /// Try to get the alloc_size attribute of the callee. May return null.
+  const AllocSizeAttr *getAllocSizeAttr() const;
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erichkeane wrote:

```suggestion
  const AllocSizeAttr *getCalleeAllocSizeAttr() const;
```

https://github.com/llvm/llvm-project/pull/150028