Use weak cell in monomorphic KeyedStore IC.

src/ic/ic-compiler.cc

Index: src/ic/ic-compiler.cc
diff --git a/src/ic/ic-compiler.cc b/src/ic/ic-compiler.cc
index 3a1731268fc2ad1ae807cb7e8a899d6c49c4abb8..cdb7ea58883d2dff9c47a772b2caa1b36e03eb47 100644
--- a/src/ic/ic-compiler.cc
+++ b/src/ic/ic-compiler.cc
@@ -451,7 +451,10 @@ Handle<Code> PropertyICCompiler::CompileKeyedStoreMonomorphic(
     stub = StoreElementStub(isolate(), elements_kind).GetCode();
   }
 
-  __ DispatchMap(receiver(), scratch1(), receiver_map, stub, DO_SMI_CHECK);
+  Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
+
+  __ DispatchWeakMap(receiver(), scratch1(), scratch2(), cell, stub,
+                     DO_SMI_CHECK);
 
   TailCallBuiltin(masm(), Builtins::kKeyedStoreIC_Miss);