RFR(M): 8028580: PPC64 (part 114/120): Support for Call nodes with constants.

[Lindenmaier, Goetz]

Hi,

C2 Call nodes use several constant values. So far C2 does not
support placing these values in the constant table of the nmethod.

Among others, these constants are
 - the called address
- the inline cache
- values required by the C-calling convention (on PPC, env pointer
   and toc from function descriptor)

This change extends Call nodes so that they can issue constants
to the constant table.
http://cr.openjdk.java.net/~goetz/webrevs/8028580-0-call/

- Extend adlc to add edge to MachConstantBaseNode if
  $constanttablebase is used in the specification.
- Extend Call nodes to deliver proper register mask to
  register allocation for this new input.
- Add method ins_num_consts() so that number of required
  constants can be specified in the call node.
- Extend output() so that it reserves space for the
  constants in the Calls, using ins_num_consts().

Please review and test this change.

Thanks and best regards,
  Goetz.

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