Reland Vector ICs: platform support for vector-based stores.

src/ic/arm64/ic-compiler-arm64.cc

 // Copyright 2014 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
 
 namespace v8 {
@@ skipping 98 matching lines @@
   __ Ldr(map_reg, FieldMemOperand(receiver(), HeapObject::kMapOffset));
   for (int i = 0; i < receiver_count; i++) {
     Handle<WeakCell> cell = Map::WeakCellForMap(receiver_maps->at(i));
     __ CmpWeakValue(map_reg, cell, scratch2());
     Label skip;
     __ B(&skip, ne);
     if (!transitioned_maps->at(i).is_null()) {
       // This argument is used by the handler stub. For example, see
       // ElementsTransitionGenerator::GenerateMapChangeElementsTransition.
       Handle<WeakCell> cell = Map::WeakCellForMap(transitioned_maps->at(i));
-      __ LoadWeakValue(transition_map(), cell, &miss);
+      Register transition_map = scratch1();
+      DCHECK(!FLAG_vector_stores &&
+             transition_map.is(StoreTransitionDescriptor::MapRegister()));
+      __ LoadWeakValue(transition_map, cell, &miss);
     }
     __ Jump(handler_stubs->at(i), RelocInfo::CODE_TARGET);
     __ Bind(&skip);
   }
 
   __ Bind(&miss);
   TailCallBuiltin(masm(), MissBuiltin(kind()));
 
   return GetCode(kind(), Code::NORMAL, factory()->empty_string(), POLYMORPHIC);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64