RFR (XL): 8019972: PPC64 (part 9): platform files for interpreter only VM.

[Lindenmaier, Goetz]

Hi,

This change contains all the files in cpu/ppc and os_cpu/linux_ppc needed for
the PPC64 interpreter port on linux.

With this change you can do a core build on ppc64 and run the VM interpreter only.
It executes simple programs as jvm98.
The change requires

*         8016697: Use stubs to implement safefetch

*         8020059: The flag introduced by 8014972 is not defined ...
which will arrive soon in the staging repository.

I marked the change as XL as it contains a lot of code.  Nevertheless the
code has no impact on the existing Oracle platforms.

The change touches a single shared file, globals.hpp, removing a
special case introduced for the port.  This is because we
integrated some changes earlier than originally intended.

Please review the change.  Does it need testing on Oracle side?

Best regards,
  Goetz.