[builtins] Remove STRING_ADD_LEFT and STRING_ADD_RIGHT builtins.

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/heap.h"
 #include "src/objects.h"
 
@@ skipping 72 matching lines @@
   V(REFLECT_APPLY_INDEX, JSFunction, reflect_apply)                       \
   V(REFLECT_CONSTRUCT_INDEX, JSFunction, reflect_construct)               \
   V(SPREAD_ARGUMENTS_INDEX, JSFunction, spread_arguments)                 \
   V(SPREAD_ITERABLE_INDEX, JSFunction, spread_iterable)                   \
   V(TO_LENGTH_FUN_INDEX, JSFunction, to_length_fun)                       \
   V(TO_NUMBER_FUN_INDEX, JSFunction, to_number_fun)                       \
   V(TO_PRIMITIVE_INDEX, JSFunction, to_primitive)                         \
   V(TO_STRING_FUN_INDEX, JSFunction, to_string_fun)
 
 
-#define NATIVE_CONTEXT_JS_BUILTINS(V)                                   \
-  V(APPLY_PREPARE_BUILTIN_INDEX, JSFunction, apply_prepare_builtin)     \
-  V(COMPARE_BUILTIN_INDEX, JSFunction, compare_builtin)                 \
-  V(COMPARE_STRONG_BUILTIN_INDEX, JSFunction, compare_strong_builtin)   \
-  V(CONCAT_ITERABLE_TO_ARRAY_BUILTIN_INDEX, JSFunction,                 \
-    concat_iterable_to_array_builtin)                                   \
-  V(EQUALS_BUILTIN_INDEX, JSFunction, equals_builtin)                   \
-  V(REFLECT_APPLY_PREPARE_BUILTIN_INDEX, JSFunction,                    \
-    reflect_apply_prepare_builtin)                                      \
-  V(REFLECT_CONSTRUCT_PREPARE_BUILTIN_INDEX, JSFunction,                \
-    reflect_construct_prepare_builtin)                                  \
-  V(STRING_ADD_LEFT_BUILTIN_INDEX, JSFunction, string_add_left_builtin) \
-  V(STRING_ADD_RIGHT_BUILTIN_INDEX, JSFunction, string_add_right_builtin)
+#define NATIVE_CONTEXT_JS_BUILTINS(V)                                 \
+  V(APPLY_PREPARE_BUILTIN_INDEX, JSFunction, apply_prepare_builtin)   \
+  V(COMPARE_BUILTIN_INDEX, JSFunction, compare_builtin)               \
+  V(COMPARE_STRONG_BUILTIN_INDEX, JSFunction, compare_strong_builtin) \
+  V(CONCAT_ITERABLE_TO_ARRAY_BUILTIN_INDEX, JSFunction,               \
+    concat_iterable_to_array_builtin)                                 \
+  V(EQUALS_BUILTIN_INDEX, JSFunction, equals_builtin)                 \
+  V(REFLECT_APPLY_PREPARE_BUILTIN_INDEX, JSFunction,                  \
+    reflect_apply_prepare_builtin)                                    \
+  V(REFLECT_CONSTRUCT_PREPARE_BUILTIN_INDEX, JSFunction,              \
+    reflect_construct_prepare_builtin)
 
 
 #define NATIVE_CONTEXT_IMPORTED_FIELDS(V)                                     \
   V(ARRAY_CONCAT_INDEX, JSFunction, array_concat)                             \
   V(ARRAY_POP_INDEX, JSFunction, array_pop)                                   \
   V(ARRAY_PUSH_INDEX, JSFunction, array_push)                                 \
   V(ARRAY_SHIFT_INDEX, JSFunction, array_shift)                               \
   V(ARRAY_SPLICE_INDEX, JSFunction, array_splice)                             \
   V(ARRAY_SLICE_INDEX, JSFunction, array_slice)                               \
   V(ARRAY_UNSHIFT_INDEX, JSFunction, array_unshift)                           \
@@ skipping 438 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_