RFR (S): 8029025: PPC64 (part 203): opto: Move static _in_dump_cnt to Compile object.

[Lindenmaier, Goetz]

Hi,

I prepared a webrev containing some debugging support.
http://cr.openjdk.java.net/~goetz/webrevs/8029025-0-ndmp/

To allow some special cases when dumping debug information about IR
nodes, _in_dump_cnt can be increased. Unfortunately this is a global
field.  If running with more than one compiler thread races can happen.
As consequence, dumping crashes e.g. in MachProjNode::adr_type().

This change moves the field to the Compile object.

It also introduces the compiler oracle 'option' feature for PrintAssembly.

This is not a mandatory part of the port, but we find this very useful
if debugging the compiler.

Please review and test this change

Best regards,
  Goetz.