g++ std::map initializing raises segmentation fault.

[Masamichi Hosoda <trueroad@trueroad.jp>]

Hello,

On Cygwin 2.8.1 x86_64, I've found that g++ std:map initializing
may raise segmentation fault.
The binary compiled with cygwin-devel-2.8.0-1
does not raise segmentation fault
even if on Cygwin 2.8.1 x86_64 environments.

So I suspect cygwin-devel-2.8.1-1 is the cause.

Here's sample code for reproduce.

```
// foo.cc
// g++ -std=c++11 foo.cc

#include<iostream>
#include<map>

std::map<int, int> m
{
  { 1, 1},
  { 2, 2}
};

int main ()
{
  std::cout << "Hello World!" << std::endl;
}
```

I've reproduced it on both Windows 7 64 bit and Windows 10 64 bit.

```
$ ./a
Segmentation fault (core dumped)

$
```

Here's my environment.

```
$ uname -a
CYGWIN_NT-10.0 Z87EXTREAM4 2.8.1(0.312/5/3) 2017-07-03 14:11 x86_64 Cygwin

$ g++ --version
g++ (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


$
```

Thanks

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