Fix deoptimizer for shared optimized code.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 48022b049c0790f18292984843e39aaa3872e9db..47eb9479a093031d15727f78a5b49f5b67290401 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8046,11 +8046,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyDeoptimized) {
     return isolate->heap()->undefined_value();
   }
 
-  // Find other optimized activations of the function.
+  // Find other optimized activations of the function or functions that
+  // share the same optimized code.
   bool has_other_activations = false;
   while (!it.done()) {
     JavaScriptFrame* frame = it.frame();
-    if (frame->is_optimized() && frame->function() == *function) {
+    JSFunction* other_function = JSFunction::cast(frame->function());
+    if (frame->is_optimized() && other_function->code() == function->code()) {
       has_other_activations = true;
       break;
     }