[clang][Interp][NFC] Use delegate() address-of operators

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -2549,9 +2549,7 @@ bool ByteCodeExprGen<Emitter>::VisitUnaryOperator(const UnaryOperator *E) {
     return DiscardResult ? this->emitPop(*T, E) : true;
   case UO_AddrOf: // &x
     // We should already have a pointer when we get here.
-    if (!this->visit(SubExpr))
-      return false;
-    return DiscardResult ? this->emitPop(*T, E) : true;
+    return this->delegate(SubExpr);
   case UO_Deref:  // *x
     return dereference(
         SubExpr, DerefKind::Read,