fix crash on 64-bit mingw-w64 hosted compiler using more than 4 gb of ram

[Jakub Jelinek]

On Thu, Aug 11, 2016 at 04:55:34PM +0200, Stanislaw Halik wrote:
> On 2016-08-11 Thu 16:33, Kai Tietz wrote:
> >Hello Stanislaw.
> >
> >patch is ok.  Nevertheless there is a ChangeLog entry missing for it.
> >It is mandatory to be provided for submissions to gcc.
> 
> ChangeLog:
> 
> PR target/66488
> * gcc/config/i386/xm-mingw32.h (HOST_BITS_PER_PTR): specify pointer
> size as distinct from sizeof long, for the use in gcc/ggc-page.c

gcc/ directory has its own ChangeLog, the filename is relative against that.
The description should start after ): with capital letter, end with .
And the description is what has changed, not why.
So
	PR target/66488
	* config/i386/xm-mingw32.h (HOST_BITS_PER_PTR): Define if __x86_64__.
or so would be better.

	Jakub