RFR(M): 8024921: PPC64 (part 113): Extend Load and Store nodes to know about memory ordering.

[Lindenmaier, Goetz]

Hi,

I prepared a webrev for 8024921<https://bugs.openjdk.java.net/browse/JDK-8024921>Extend Load and Store nodes to know about memory ordering.
This is part of the PPC port.
http://cr.openjdk.java.net/~goetz/webrevs/8024921-0-ldst/

For a detailed description see the text in the webrev and bug description.

All this basically does is add a field to load and store nodes and
change all constructor calls to set this field.  So the effect on
existing platforms should be very small.  Therefore I marked this
'M', although quite some lines of code are touched.

Please review and test this change.
I'm happy to incorporate your comments and any improvements
you propose.

Best regards,
  Goetz.