RFR(M): 8223051: support loops with long (64b) trip counts

[John Rose]

On May 29, 2020, at 4:15 AM, Roland Westrelin <rwestrel at redhat.com> wrote:
> 
>> 
>> I suggest hardwiring it to 10 locally in loopnode.cpp, and
>> making it a tunable parameter later on if we actually
>> run into trouble with it.  But we won’t; nobody is going
>> to write loops with strides on the order of max_jint.
>> In fact, you can leave out this suggestion altogether,
>> if you are not comfortable with it, and we just take the
>> odd performance hit if someone does something that
>> strange.
> 
> I thought about this a bit when I prepared the change and I left the
> code as is so as many loop transformations as possible are performed to
> shake out bugs thinking it could be revised later.

FTR, I’m fine with this.  I have no more review comments.

— John