RFR (XS) 8225104: 32-bit build failures after JDK-8222252

[Roman Kennke]

Yes looks good and trivial. Thanks!

Roman


> Bug:
>   https://bugs.openjdk.java.net/browse/JDK-8225104
> 
> The new UseCompressedOops block has to be protected with _LP64, like all other blocks are. I think
> it is a trivial change, please review.
> 
> Fix:
>   http://cr.openjdk.java.net/~shade/8225104/webrev.01/
> 
> Testing: {x86_32, x86_64} builds
>