RFR: 8194406: Use Atomic::replace_if_null

[Kim Barrett]

> On Jan 4, 2018, at 6:54 AM, David Holmes <david.holmes at oracle.com> wrote:
> 
> Looks good.

Thanks.

> 
> Thanks,
> David
> 
> On 4/01/2018 5:57 PM, Kim Barrett wrote:
>>> On Jan 3, 2018, at 3:15 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
>>> 
>>>> On Jan 2, 2018, at 11:41 PM, David Holmes <david.holmes at oracle.com> wrote:
>>> 
>>>> ./share/utilities/bitMap.cpp:    if (Atomic::cmpxchg(table, &_pop_count_table, (BitMap::idx_t*)NULL) != NULL) {
>>> 
>>> Thanks for spotting that one.
>> I missed that one because my grep pattern didn't include qualified
>> type names in the cast.  Fixing my search, I didn't find any other
>> calls to update.
>> Here's the updated webrev:
>> http://cr.openjdk.java.net/~kbarrett/8194406/open.01/
>> Only change is to bitMap.cpp.