Revert of Turn StoreIC::Megamorphic into a builtin, get rid of the non-monomorphic-cache

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index ab121873ed1606a54eddb512c7478e558713152c..59d7dfcf002f9229018a4965cdc0617eeef70541 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -162,6 +162,7 @@
   V(HeapNumber, minus_infinity_value, MinusInfinityValue)                      \
   V(JSObject, message_listeners, MessageListeners)                             \
   V(UnseededNumberDictionary, code_stubs, CodeStubs)                           \
+  V(UnseededNumberDictionary, non_monomorphic_cache, NonMonomorphicCache)      \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
   V(FixedArray, natives_source_cache, NativesSourceCache)                      \
@@ -976,6 +977,11 @@
     roots_[kCodeStubsRootIndex] = value;
   }
 
+  // Sets the non_monomorphic_cache_ (only used when expanding the dictionary).
+  void SetRootNonMonomorphicCache(UnseededNumberDictionary* value) {
+    roots_[kNonMonomorphicCacheRootIndex] = value;
+  }
+
   void SetRootMaterializedObjects(FixedArray* objects) {
     roots_[kMaterializedObjectsRootIndex] = objects;
   }