RFR: AArch64: Fix endless loop / stack-corruption

[Aleksey Shipilev]

On 05/04/2018 11:23 PM, Roman Kennke wrote:
> In aarch64's
> TemplateInterpreterGenerator::generate_Reference_get_entry(void), there
> used to be enter()/leave() calls around the g1 pre-barrier. This is
> necessary in case the barrier calls into the runtime, to setup/remove
> stack frames for the call. With the interpreter BarrierSetAssembler
> work, this seems to have been dropped. It does lead to stack corruption,
> sometimes endless loops, etc.
> 
> This patch re-instates the missing enter()/leave() calls where they have
> been. This makes hotspot_gc_shenandoah tests happy (finally!)
> 
> I filed
> https://bugs.openjdk.java.net/browse/JDK-8202676
> 
> to track and fix this upstream.
> 
> http://cr.openjdk.java.net/~rkennke/aarch64-fix-barrier-rt-call/webrev.00/
> 
> Ok to push?

OK.

-Aleksey