[infra] Fixes for cross-toolchains

third_party/tcmalloc/BUILD.gn

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 config("internal_config") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
   cflags = [
     "-Wall",
     "-Wextra",
     "-Wno-missing-field-initializers",
@@ skipping 83 matching lines @@
     defines += [ "NO_TCMALLOC_SAMPLES" ]
   }
 
   cflags = [
     "-Wnon-virtual-dtor",
     "-Woverloaded-virtual",
     "-fno-rtti",
     "-fpermissive",
   ]
 
-  if (!is_clang && current_cpu == "x86") {
+  if (!is_clang) {
     cflags += [ "-Wno-format" ]
   }
 
   set_sources_assignment_filter([
                                   # No debug allocator.
                                   "gperftools/src/debugallocation.cc",
 
                                   # Not needed when using emergency malloc.
                                   "gperftools/src/fake_stacktrace_scope.cc",
 
                                   # Not using the cpuprofiler
                                   "gperftools/src/base/thread_lister.c",
                                   "gperftools/src/base/thread_lister.h",
                                   "gperftools/src/profile-handler.cc",
                                   "gperftools/src/profile-handler.h",
                                   "gperftools/src/profiledata.cc",
                                   "gperftools/src/profiledata.h",
                                   "gperftools/src/profiler.cc",
                                 ])
 
   sources = tcmalloc_sources_list.sources
 }