RFR(M) 8201447: C1 does backedge profiling incorrectly

[Tom Rodriguez]

Looks good.

tom

Igor Veresov wrote:
> C1 incorrectly incremented a back branch counter for both arms of a conditional branch if one of the arms were a back branch. This fix makes the increment conditional and applicable only to the appropriate arm.
> 
> Webrev: http://cr.openjdk.java.net/~iveresov/8201447/webrev.01/
> 
> Internal performance testing showed no adverse effects of the change.
> 
> Thanks,
> igor
>