[ic] Encode LoadGlobalIC's typeof mode in slot kind instead of code object's flags.

src/heap/heap.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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 2738 matching lines @@
   set_experimental_extra_natives_source_cache(
       *factory->NewFixedArray(ExperimentalExtraNatives::GetBuiltinsCount()));
 
   set_undefined_cell(*factory->NewCell(factory->undefined_value()));
 
   // Microtask queue uses the empty fixed array as a sentinel for "empty".
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
   set_microtask_queue(empty_fixed_array());
 
   {
-    StaticFeedbackVectorSpec spec;
-    FeedbackVectorSlot slot = spec.AddLoadICSlot();
-    DCHECK_EQ(slot, FeedbackVectorSlot(TypeFeedbackVector::kDummyLoadICSlot));
-    USE(slot);
-
-    Handle<TypeFeedbackMetadata> dummy_metadata =
-        TypeFeedbackMetadata::New(isolate(), &spec);
-    Handle<TypeFeedbackVector> dummy_vector =
-        TypeFeedbackVector::New(isolate(), dummy_metadata);
-
-    set_dummy_vector(*dummy_vector);
-
-    // Now initialize dummy vector's entries.
-    LoadICNexus(isolate()).ConfigureMegamorphic();
-  }
-
-  {
     // Create a canonical empty TypeFeedbackVector, which is shared by all
     // functions that don't need actual type feedback slots. Note however
     // that all these functions will share the same invocation count, but
     // that shouldn't matter since we only use the invocation count to
     // relativize the absolute call counts, but we can only have call counts
     // if we have actual feedback slots.
     Handle<FixedArray> empty_type_feedback_vector = factory->NewFixedArray(
         TypeFeedbackVector::kReservedIndexCount, TENURED);
     empty_type_feedback_vector->set(TypeFeedbackVector::kMetadataIndex,
                                     empty_fixed_array());
@@ skipping 3802 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8