[RFC] Enable autoinlining for size at -O1+

[Eric Christopher]

>>
>>
>> Patch was bootstrapped/regtested x86_64-linux.
>
> I think this is the correct way to go.  Still I wouldn't have added an
> extra flag for this (but possibly others disagree here).  This is ok  
> for
> mainline if there are no complaints within a reasonable time.

I like the patch, and I don't mind the extra flag, I don't think it  
hurts anything :)

-eric