8134321: tools/pack200/Pack200Test.java crashes in the VM PIT jdk9 b79

[Roland Westrelin]

Thanks for the review, Vladimir.

Roland.

> On Aug 26, 2015, at 6:27 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> Reasonable fix. Looks good.
> 
> Thanks,
> Vladimir
> 
> On 8/26/15 6:52 AM, Roland Westrelin wrote:
>> http://cr.openjdk.java.net/~roland/8134321/webrev.00/
>> 
>> At a safepoint, when we capture the field values for an object whose allocation is about to be eliminated, if one of these field values is behind a Phi and on one branch of the Phi the field value may be written to by arraycopy but we don't know for sure, then we should not eliminate the allocation but with the current code we simply proceed with a broken field value.
>> 
>> Roland.
>>