HiPE backend for PPC64

[Kostis Sagonas]

There is a new back end of the HiPE native code compiler for PPC64 
(PowerPC 64).  The relevant fetch command is:

    git fetch git://github.com/kostis/otp.git hipe-ppc64

Please include into 'pu'/'dev'.

Also, I would appreciate some feedback from interested users who want to 
test this early on whether this is auto-enabled in PPC64 architectures 
and native compiled code works OK for things they have tried -- I have 
only very limited access to such a machine.

Kostis