Use assembly instead of C array literals to link the core snapshot into the VM.

tools/gyp/configurations_make.gypi

 # Copyright (c) 2011, 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.
 
 {
   'variables': {
     'dart_debug_optimization_level%': '2',
   },
   'target_defaults': {
     'configurations': {
       'Dart_Linux_Base': {
         'abstract': 1,
         'defines': [
           '_FORTIFY_SOURCE=2',
         ],
         'cflags': [
-          '-Werror',
           '<@(common_gcc_warning_flags)',
           '-Wnon-virtual-dtor',
           '-Wvla',
           '-Woverloaded-virtual',
           '-g3',
           '-ggdb3',
           '-fno-rtti',
           '-fno-exceptions',
           '-fstack-protector',
           '-Wa,--noexecstack',
@@ skipping 350 matching lines @@
           '-ffunction-sections',
           '-fomit-frame-pointer',
         ],
         'ldflags': [
           '-Wl,--gc-sections',
         ],
       },
     },
   },
 }