RFR (L, but tedious) 8188220: Remove Atomic::*_ptr() uses and overloads from hotspot

[Kim Barrett]

> On Oct 16, 2017, at 11:59 AM, coleen.phillimore at oracle.com wrote:
> 
> 
> The latest incremental based on these comments (now running tier1).
> http://cr.openjdk.java.net/~coleenp/8188220.review-comments.02/webrev/index.html
> 
> plus what Roman sent in the "RFR: 8189333: Fix Zero build after Atomic::xchg changes" thread.

Looks good.

I’ll file an RFR for replace_if_null