[9] RFR(XS): 8154763: Crash with "assert(RangeCheckElimination)" if RangeCheckElimination is disabled

[Christian Thalinger]

Not a review but I think PostLoopMultiversioning should be a diagnostic_pd.  I’ve added a comment to this Enhancement:

https://bugs.openjdk.java.net/browse/JDK-8150900

> On Apr 21, 2016, at 3:56 AM, Tobias Hartmann <tobias.hartmann at oracle.com> wrote:
> 
> Hi,
> 
> please review the following patch:
> 
> https://bugs.openjdk.java.net/browse/JDK-8154763
> http://cr.openjdk.java.net/~thartmann/8154763/webrev.00/
> 
> JDK-8151573 introduced multiversioning for range check elimination. Explicitly turning of range check elimination now crashes the VM with an assert in PhaseIdealLoop::has_range_checks() because we assume that this is only called if range check elimination is enabled.
> 
> I think we should disable multiversioning if range check elimination is turned off. I added the corresponding check.
> 
> Tested with regression test and RBT (running).
> 
> Thanks,
> Tobias
>