RFR: JDK-8077265 Modify assert to help debug JDK-8068448

[Jesper Wilhelmsson]

Looks good!

Since you are changing the message, let's not keep the old, non-informative 
"Sanity" in psPromotionLAB.cpp. A few words about what went wrong would be more 
helpful together with the numbers you added.

Thanks,
/Jesper


Eric Caspole skrev den 9/4/15 15:19:
> HI everybody,
> Here is a webrev to add more asserts related to debugging JDK-8068448. Beyond
> capturing more info in the original assert, after looking at another core I
> added more asserts to make sure there is no other place where old gen
> allocations would overrun the start array.
>
>   http://cr.openjdk.java.net/~ecaspole/JDK-8077265/00/webrev/
>
> Passes JPRT.
> Thanks,
> Eric