RFR (M): 8030863: PPC64: (part 220): ConstantTableBase for calls between args and jvms

[Lindenmaier, Goetz]

Hi,

The change "8028580: PPC64 (part 114/120): Support for Call nodes with constants. "
adds MachConstantBase node for Calls at req()-1 during
expand. Reister allocation adds the derived/base pairs and then
uses the wrong register maps for allocation, because the MachConstantBase
node is no more at req()-1

Now add the edge in the matcher when the node is complete. Add it
after parameters and before jvms. Adapt jvms offsets. Also assure
jvms is always cloned, else the offset gets wrong.

So far, $constanttablebase is only used in Calls on PPC, so this has no effect on
other platforms.

Please review and test this change.
http://cr.openjdk.java.net/~goetz/webrevs/8030863-0-call/

Best regards,
  Goetz.