RFR (M): 8019519: PPC64 (part 105): C interpreter: implement support for jvmti early return.

[Lindenmaier, Goetz]

Hi,

This change implements jvmti early return  and pop frame support
in the cppInterpreter. To work properly, the corresponding properties in
JvmtiManageCapabilities::init_onload_capabilities() must be enabled.
We will add this in a later change.

I would be happy about a review of this change:
http://cr.openjdk.java.net/~goetz/webrevs/8019519-cInter_earlyRet/

Best regards,
  Goetz.