[foozzie] Support multi-architecture builds

gni/v8.gni

 # Copyright 2016 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.
 
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/v8_target_cpu.gni")
 
 declare_args() {
   # Includes files needed for correctness fuzzing.
   v8_correctness_fuzzer = false
 
+  # Adds additional compile target for building multiple architectures at once.
+  v8_multi_arch_build = false
+
   # Indicate if valgrind was fetched as a custom deps to make it available on
   # swarming.
   v8_has_valgrind = false
 
   # Indicate if gcmole was fetched as a hook to make it available on swarming.
   v8_gcmole = false
 
   # Turns on compiler optimizations in V8 in Debug build.
   v8_optimized_debug = true
 
@@ skipping 109 matching lines @@
 }
 
 template("v8_component") {
   component(target_name) {
     forward_variables_from(invoker, "*", [ "configs" ])
     configs += invoker.configs
     configs -= v8_remove_configs
     configs += v8_add_configs
   }
 }