3.6.1 nomination: 'optnone' should not disable DAG combiner

[Owen Anderson]

Approved.

—Owen

> On Mar 31, 2015, at 5:33 PM, Tom Stellard <tom at stellard.net> wrote:
> 
> Owen, what do you think?
> 
> On Wed, Apr 01, 2015 at 12:22:41AM +0000, Robinson, Paul wrote:
>> I'm requesting r233153 and r233584 get merged to the 3.6 branch.
>> 233153 causes 'optnone' _not_ to disable the entire DAG combiner,
>> because disabling the combiner can lead to instruction-selection 
>> crashes. 233584 is the test for that patch.
>> Thanks,
>> --paulr
>>