Remove custom weak handling of monomorphic IC.

src/ic/ic.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 456 matching lines @@
     old_state = old_target->ic_state();
     new_state = target->ic_state();
     target_remains_ic_stub = true;
   }
 
   OnTypeFeedbackChanged(isolate, address, old_state, new_state,
                         target_remains_ic_stub);
 }
 
 
-void IC::RegisterWeakMapDependency(Handle<Code> stub) {
-  if (FLAG_collect_maps && FLAG_weak_embedded_maps_in_ic &&
-      stub->CanBeWeakStub()) {
-    DCHECK(!stub->is_weak_stub());
-    MapHandleList maps;
-    stub->FindAllMaps(&maps);
-    if (maps.length() == 1 && stub->IsWeakObjectInIC(*maps.at(0))) {
-      Map::AddDependentIC(maps.at(0), stub);
-      stub->mark_as_weak_stub();
-      if (FLAG_enable_ool_constant_pool) {
-        stub->constant_pool()->set_weak_object_state(
-            ConstantPoolArray::WEAK_OBJECTS_IN_IC);
-      }
-    }
-  }
-}
-
-
-void IC::InvalidateMaps(Code* stub) {
-  DCHECK(stub->is_weak_stub());
-  stub->mark_as_invalidated_weak_stub();
-  Isolate* isolate = stub->GetIsolate();
-  Heap* heap = isolate->heap();
-  Object* undefined = heap->undefined_value();
-  int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
-  for (RelocIterator it(stub, mode_mask); !it.done(); it.next()) {
-    RelocInfo::Mode mode = it.rinfo()->rmode();
-    if (mode == RelocInfo::EMBEDDED_OBJECT &&
-        it.rinfo()->target_object()->IsMap()) {
-      it.rinfo()->set_target_object(undefined, SKIP_WRITE_BARRIER);
-    }
-  }
-  CpuFeatures::FlushICache(stub->instruction_start(), stub->instruction_size());
-}
-
-
 void IC::Clear(Isolate* isolate, Address address,
                ConstantPoolArray* constant_pool) {
   Code* target = GetTargetAtAddress(address, constant_pool);
 
   // Don't clear debug break inline cache as it will remove the break point.
   if (target->is_debug_stub()) return;
 
   switch (target->kind()) {
     case Code::LOAD_IC:
       if (FLAG_vector_ics) return;
@@ skipping 2485 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal