Have one, long-lived map for bound functions.

src/contexts.h

 // 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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap.h"
 #include "src/objects.h"
 
@@ skipping 112 matching lines @@
       uint8_clamped_array_external_map) \
   V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun) \
   V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map) \
   V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map, \
     sloppy_function_with_readonly_prototype_map) \
   V(STRICT_FUNCTION_MAP_INDEX, Map, strict_function_map) \
   V(SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \
     sloppy_function_without_prototype_map) \
   V(STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX, Map, \
     strict_function_without_prototype_map) \
+  V(BOUND_FUNCTION_MAP_INDEX, Map, bound_function_map) \
   V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map)\
   V(SLOPPY_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
     sloppy_arguments_boilerplate) \
   V(ALIASED_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
     aliased_arguments_boilerplate) \
   V(STRICT_ARGUMENTS_BOILERPLATE_INDEX, JSObject, \
     strict_arguments_boilerplate) \
   V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners) \
   V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun) \
   V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun) \
@@ skipping 121 matching lines @@
     SECURITY_TOKEN_INDEX,
     SLOPPY_ARGUMENTS_BOILERPLATE_INDEX,
     ALIASED_ARGUMENTS_BOILERPLATE_INDEX,
     STRICT_ARGUMENTS_BOILERPLATE_INDEX,
     REGEXP_RESULT_MAP_INDEX,
     SLOPPY_FUNCTION_MAP_INDEX,
     SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX,
     STRICT_FUNCTION_MAP_INDEX,
     SLOPPY_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
     STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX,
+    BOUND_FUNCTION_MAP_INDEX,
     INITIAL_OBJECT_PROTOTYPE_INDEX,
     INITIAL_ARRAY_PROTOTYPE_INDEX,
     BOOLEAN_FUNCTION_INDEX,
     NUMBER_FUNCTION_INDEX,
     STRING_FUNCTION_INDEX,
     STRING_FUNCTION_PROTOTYPE_MAP_INDEX,
     SYMBOL_FUNCTION_INDEX,
     OBJECT_FUNCTION_INDEX,
     INTERNAL_ARRAY_FUNCTION_INDEX,
     ARRAY_FUNCTION_INDEX,
@@ skipping 265 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_