RFR: Remove obsolete and unused reduce-storeval-barrier optimization code

[Roman Kennke]

Am 18.09.2017 um 11:58 schrieb Aleksey Shipilev:
> On 09/16/2017 11:37 AM, Roman Kennke wrote:
>> Ok. I fixed one place in library_call.cpp in the cmpxchg intrinsics. Everything else should be ok:
>>
>> http://cr.openjdk.java.net/~rkennke/remove-reduce-storeval/webrev.01/
> *) I wonder if instead of putting shenandoah_storeval_barrier prior to store_oop_* calls, we are
> better putting the barriers calls inside of them? Under UseShenandoahGC flag? Otherwise, I see
> missing shenandoah_storeval_barrier in GraphKit::builtin_throw and Parse::expand_multianewarray.
>
> Seems good otherwise.
Good point. Like this?

http://cr.openjdk.java.net/~rkennke/remove-reduce-storeval/webrev.02/ 
<http://cr.openjdk.java.net/%7Erkennke/remove-reduce-storeval/webrev.02/>