[ic][stubs] Move more IC-related methods from CSA to AccessorAssembler.

src/ic/keyed-store-generic.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ic/keyed-store-generic.h"
 
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/contexts.h"
 #include "src/ic/accessor-assembler-impl.h"
@@ skipping 344 matching lines @@
         Bind(&found_hole);
       }
       BranchIfPrototypesHaveNonFastElements(receiver_map, slow,
                                             &hole_check_passed);
       Bind(&hole_check_passed);
     }
 
     // Try to store the value as a double.
     {
       Label non_number_value(this);
-      Node* double_value = PrepareValueForWrite(value, Representation::Double(),
-                                                &non_number_value);
+      Node* double_value = TryTaggedToFloat64(value, &non_number_value);
+
       // Make sure we do not store signalling NaNs into double arrays.
       double_value = Float64SilenceNaN(double_value);
       // If we're about to introduce holes, ensure holey elements.
       if (update_length == kBumpLengthWithGap) {
         TryChangeToHoleyMap(receiver, receiver_map, elements_kind, context,
                             FAST_DOUBLE_ELEMENTS, slow);
       }
       StoreNoWriteBarrier(MachineRepresentation::kFloat64, elements, offset,
                           double_value);
       MaybeUpdateLengthAndReturn(receiver, intptr_index, value, update_length);
@@ skipping 401 matching lines @@
   Bind(&slow);
   {
     Comment("KeyedStoreGeneric_slow");
     TailCallRuntime(Runtime::kSetProperty, context, receiver, name, value,
                     SmiConstant(language_mode));
   }
 }
 
 }  // namespace internal
 }  // namespace v8