RFR: 8205683: Refactor heap allocation to separate concerns

[Kim Barrett]

> On Jun 27, 2018, at 10:39 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On Jun 27, 2018, at 9:23 AM, Erik Österlund <erik.osterlund at oracle.com> wrote:
>> 
>> Incremental:
>> http://cr.openjdk.java.net/~eosterlund/8205683/webrev.02_03/
>> 
>> Full:
>> http://cr.openjdk.java.net/~eosterlund/8205683/webrev.03/
> 
> I really like the overall approach.

Erik and I talked off-line.  He confirmed my understanding of how the
extension protocol for mem_allocate is supposed to work.  The
remaining suggestions were easily dealt with, so I don't need to wait
for another webrev.  Looks good.