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

[Kim Barrett]

> On Oct 11, 2017, at 7:07 AM, coleen.phillimore at oracle.com wrote:
> 
> 
> 
> On 10/11/17 4:12 AM, Robbin Ehn wrote:
>> On 10/11/2017 10:09 AM, David Holmes wrote:
>>> On 11/10/2017 5:45 PM, Erik Österlund wrote:
>>> 
>>> Removing the operation is a different argument to renaming it. Most of the above argues for removing it. :)
>> 
>> +1 on removing
> 
> Thank you for all your feedback.  Erik best described what I was thinking.  I will remove it then.  There were not that many instances and one instance that people thought would be useful, needed the old return value.

I’ve already registered my objection to removal.  I disagree with several of Erik’s points, which don’t
address or miss the issues brought up in the original discussion that led to its introduction, as quoted
by David.

I’m still slogging my way through the review, maybe about 3/4 of the way through.  

I’ve found a number of real problems, some pre-existing and discovered by looking at the code
around your changes; I think there are a couple of ABA bugs, for example.  I’m worried that I’m
missing some too, because I’m getting burned out from reading reams of lock-free code.  This
is *really* hard, and I very much wish it had been broken up into more easily digestible chunks.