RFR: 8192123: Zero should use compiler built-ins for atomics on linux-arm

[John Paul Adrian Glaubitz]

Hi Andrew!

On 11/29/2017 04:04 PM, Andrew Haley wrote:
> Hmm.  This doesn't fix a bug, and there's a non-zero probability of
> introducing one.  I guess it should be OK, but this is a combination
> of performance improvement (possibly) and cleanup.

Can you have another look at the change before I can push my commit?

See: http://cr.openjdk.java.net/~glaubitz/8192123/webrev.00/

Adrian

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  .''`.  John Paul Adrian Glaubitz
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