[NFC][Clang] Adopt simplified getTrailingObjects in ExprObjC (#143254)

Author: jurahul

clang/include/clang/AST/ExprObjC.h

@@ -217,12 +217,10 @@ class ObjCArrayLiteral final
   SourceRange getSourceRange() const LLVM_READONLY { return Range; }
 
   /// Retrieve elements of array of literals.
-  Expr **getElements() { return getTrailingObjects<Expr *>(); }
+  Expr **getElements() { return getTrailingObjects(); }
 
   /// Retrieve elements of array of literals.
-  const Expr * const *getElements() const {
-    return getTrailingObjects<Expr *>();
-  }
+  const Expr *const *getElements() const { return getTrailingObjects(); }
 
   /// getNumElements - Return number of elements of objective-c array literal.
   unsigned getNumElements() const { return NumElements; }