Add bignum fall-back when the fast dtoa doesn't succeed. This removes Gay's d...

src/SConscript

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 23 matching lines @@
 
 
 SOURCES = {
   'all': Split("""
     accessors.cc
     allocation.cc
     api.cc
     assembler.cc
     ast.cc
     bignum.cc
+    bignum-dtoa.cc
     bootstrapper.cc
     builtins.cc
     cached-powers.cc
     checks.cc
     circular-queue.cc
     code-stubs.cc
     codegen.cc
     compilation-cache.cc
     compiler.cc
     contexts.cc
@@ skipping 267 matching lines @@
       snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')