Use math_narrow_eval more consistently [committed]

[Steve Ellcey]

On Thu, 2015-09-24 at 23:36 +0000, Joseph Myers wrote:
> You appear to have missed the ChangeLog update in your commit; please add 
> the missing ChangeLog entry.  We do not have automatic ChangeLog 
> generation implemented yet, so commits still need to include a change to 
> the ChangeLog file.

Yes, I did miss that.  I will add it now.

Steve Ellcey
sellcey@imgtec.com