Fix more fallout from making OptimizeFunctionOnNextCall work as advertised.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index f0c5edc53b1e8947646ddac4420a27a65d8149e9..43aafd4afbfab2338af65359aa4a6e535bb506e5 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8477,7 +8477,7 @@ RUNTIME_FUNCTION(Runtime_CompileOptimized) {
   if (Compiler::GetOptimizedCode(function, unoptimized, mode).ToHandle(&code)) {
     function->ReplaceCode(*code);
   } else {
-    function->ReplaceCode(*unoptimized);
+    function->ReplaceCode(function->shared()->code());
   }
 
   DCHECK(function->code()->kind() == Code::FUNCTION ||