Combiner fix for PR79910

[Jeff Law]

On 03/15/2017 11:07 AM, Jeff Law wrote:
> On 03/15/2017 09:00 AM, Bernd Schmidt wrote:
>> On 03/15/2017 12:09 AM, Bernd Schmidt wrote:
>>>  I'll retest with your
>>> suggestion and with the bitmap creation conditional on i1 being nonnull.
>>
>> Like this (also had to throw in a bitmap_empty_p). Retested as before.
>> Ok?
> Yea, not surprised you needed the bitmap_empty_p.
>
> OK with or without the debug counter -- your decide on whether or not to
> include it.
Given your note that you had planned to remove the dbg_cnt stuff, I went 
ahead and remove the dbg_cnt stuff, and installed the patch (and testcase).

Jeff