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

[Eric Caspole]

Hi everybody,
I updated this so the psOldGen part use a macro as Stefan suggested.
The assert in psPromotionLAB.hpp is allocating out of an already 
allocated PLAB, so I don't think that one will ever be hit but I want it 
there just in case.
And as Jesper suggested I made the message more helpful in the original 
place.

  http://cr.openjdk.java.net/~ecaspole/JDK-8077265/01/webrev/

Passes JPRT.
Thanks,
Eric

On 4/9/2015 10:01 AM, Stefan Karlsson wrote:
> Hi Eric,
>
> On 2015-04-09 15:19, Eric Caspole wrote:
>> 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.
>
> Why didn't these two new asserts get the same, more informative, error 
> message as the first assert you changed? Maybe you could extract the 
> check out to a helper macro that prints the relevant information?
>
> Another point that Bengt mentioned yesterday, is that we don't really 
> need to print the old_gen part of the assert. It's already printed in 
> the hs_err file.
>
> Thanks,
> StefanK
>
>>
>>  http://cr.openjdk.java.net/~ecaspole/JDK-8077265/00/webrev/
>>
>> Passes JPRT.
>> Thanks,
>> Eric
>