RFR 8229919: Support JNI Critical functions in object pinning API on x86_32 platforms

[Roman Kennke]

Hi Zhengyu,

It looks good to me!

Thanks,
Roman


> Please review this patch that supports JNI critical functions in object 
> pinning capable GCs on x86_32 platforms.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8229919
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8229919/webrev.00/
> 
> Test:
>    hotspot_gc_shenandoah (fastdebug and release) with 32-bit VM on Linux 
> x86_64.
>    hotspot_gc, hotspot_runtime and hotspot_compiler
>    Submit tests in progress.
> 
> Thanks,
> 
> -Zhengyu