Add exception handler cache to isolate

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
diff --git a/runtime/vm/heap.cc b/runtime/vm/heap.cc
index d8ce15740a980e1d6327333eb41a7baa3d1013b4..04dec1b028e0aefb64164ecf87bfb4690e3ebc6f 100644
--- a/runtime/vm/heap.cc
+++ b/runtime/vm/heap.cc
@@ -402,6 +402,8 @@ void Heap::CollectOldSpaceGarbage(Thread* thread,
     RecordAfterGC(kOld);
     PrintStats();
     NOT_IN_PRODUCT(PrintStatsToTimeline(&tds));
+    // Some Code objects may have been collected so invalidate handler cache.
+    thread->isolate()->handler_info_cache()->Clear();
     EndOldSpaceGC();
   }
 }