RFR (M) 8225048: Shenandoah x86_32 support

[Roman Kennke]

>> The changes look good to me. Thanks!!
> 
> Thanks! Split out test changes as JDK-8225111, so this patch does only x86_32 parts:
>   http://cr.openjdk.java.net/~shade/8225048/webrev.01/
> 
> Still passes hotspot_gc_shenandoah.

It's still got plenty of test changes in it.

Roman


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