[heap] Introduce HeapVisitor interface.

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/assembler-inl.h"
 #include "src/ast/context-slot-cache.h"
@@ skipping 2423 matching lines @@
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, with_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, debug_evaluate_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, block_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, module_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, eval_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, script_context)
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, script_context_table)
 
     ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, native_context)
     native_context_map()->set_dictionary_map(true);
-    native_context_map()->set_visitor_id(
-        StaticVisitorBase::kVisitNativeContext);
+    native_context_map()->set_visitor_id(kVisitNativeContext);
 
     ALLOCATE_MAP(SHARED_FUNCTION_INFO_TYPE, SharedFunctionInfo::kAlignedSize,
                  shared_function_info)
 
     ALLOCATE_MAP(JS_MESSAGE_OBJECT_TYPE, JSMessageObject::kSize, message_object)
     ALLOCATE_MAP(JS_OBJECT_TYPE, JSObject::kHeaderSize + kPointerSize, external)
     external_map()->set_is_extensible(false);
 #undef ALLOCATE_PRIMITIVE_MAP
 #undef ALLOCATE_VARSIZE_MAP
 #undef ALLOCATE_MAP
@@ skipping 3979 matching lines @@
     case LO_SPACE:
       return "LO_SPACE";
     default:
       UNREACHABLE();
   }
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8