RFR (M) 8225048: Shenandoah x86_32 support

[Aleksey Shipilev]

On 5/30/19 2:14 PM, Roman Kennke wrote:
> 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.

-Aleksey

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