FTR: fix for TCK crash

[Aleksey Shipilev]

On 09/25/2017 02:13 PM, Roland Westrelin wrote:
> 
> I will push the following fix to 10, 9 and 8u to fix the crash with the
> TCK that we've been seing:
> 
> http://cr.openjdk.java.net/~roland/shenandoah/tckfix/webrev.00/

Looks good. So is_top() misses the some transformations that are captured by phase->type?

Seems to be safe since it is under "if (input->Opcode() == Op_ShenandoahWBMemProj)" branch.

Thanks,
-Aleksey