Fastpath some spread-call desugaring.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ skipping 939 matching lines @@
     "src/builtins/builtins-interpreter.cc",
     "src/builtins/builtins-iterator.cc",
     "src/builtins/builtins-json.cc",
     "src/builtins/builtins-math.cc",
     "src/builtins/builtins-number.cc",
     "src/builtins/builtins-object.cc",
     "src/builtins/builtins-proxy.cc",
     "src/builtins/builtins-reflect.cc",
     "src/builtins/builtins-regexp.cc",
     "src/builtins/builtins-sharedarraybuffer.cc",
+    "src/builtins/builtins-spread.cc",
     "src/builtins/builtins-string.cc",
     "src/builtins/builtins-symbol.cc",
     "src/builtins/builtins-typedarray.cc",
     "src/builtins/builtins-utils.h",
     "src/builtins/builtins.cc",
     "src/builtins/builtins.h",
     "src/cached-powers.cc",
     "src/cached-powers.h",
     "src/cancelable-task.cc",
     "src/cancelable-task.h",
@@ skipping 2010 matching lines @@
   ]
 
   configs = [
     ":external_config",
     ":internal_config_base",
   ]
 }
 
 v8_fuzzer("wasm_data_section_fuzzer") {
 }