Use weak cells in map checks in polymorphic ICs.

src/ic/arm/ic-compiler-arm.cc

Index: src/ic/arm/ic-compiler-arm.cc
diff --git a/src/ic/arm/ic-compiler-arm.cc b/src/ic/arm/ic-compiler-arm.cc
index 7bef56e94de091e68cdc02f0da296a925286b84f..bfab8dd3d419e3f5172dc72fa7eb778e82cce583 100644
--- a/src/ic/arm/ic-compiler-arm.cc
+++ b/src/ic/arm/ic-compiler-arm.cc
@@ -72,8 +72,8 @@ Handle<Code> PropertyICCompiler::CompilePolymorphic(TypeHandleList* types,
     Handle<Map> map = IC::TypeToMap(*type, isolate());
     if (!map->is_deprecated()) {
       number_of_handled_maps++;
-      __ mov(ip, Operand(map));
-      __ cmp(map_reg, ip);
+      Handle<WeakCell> cell = Map::WeakCellForMap(map);
+      __ CmpWeakValue(map_reg, cell, scratch2());
       if (type->Is(HeapType::Number())) {
         DCHECK(!number_case.is_unused());
         __ bind(&number_case);
@@ -100,16 +100,18 @@ Handle<Code> PropertyICCompiler::CompileKeyedStorePolymorphic(
   __ JumpIfSmi(receiver(), &miss);
 
   int receiver_count = receiver_maps->length();
-  __ ldr(scratch1(), FieldMemOperand(receiver(), HeapObject::kMapOffset));
+  Register map_reg = scratch1();
+  __ ldr(map_reg, FieldMemOperand(receiver(), HeapObject::kMapOffset));
   for (int i = 0; i < receiver_count; ++i) {
-    __ mov(ip, Operand(receiver_maps->at(i)));
-    __ cmp(scratch1(), ip);
+    Handle<WeakCell> cell = Map::WeakCellForMap(receiver_maps->at(i));
+    __ CmpWeakValue(map_reg, cell, scratch2());
     if (transitioned_maps->at(i).is_null()) {
       __ Jump(handler_stubs->at(i), RelocInfo::CODE_TARGET, eq);
     } else {
       Label next_map;
       __ b(ne, &next_map);
-      __ mov(transition_map(), Operand(transitioned_maps->at(i)));
+      Handle<WeakCell> cell = Map::WeakCellForMap(transitioned_maps->at(i));
+      __ LoadWeakValue(transition_map(), cell, &miss);
       __ Jump(handler_stubs->at(i), RelocInfo::CODE_TARGET, al);
       __ bind(&next_map);
     }