959c12d Add support for ppc64.

Authored and Committed by rjones 9 years ago
    Add support for ppc64.
    
    Note (1): This patch was rejected upstream because they don't have
    appropriate hardware for testing.
    
    Note (2): Upstream powerpc directory has some support for ppc64, but
    only for Macs, and I couldn't get it to work at all with IBM hardware.
    
    This patch was collaborated on by several people, most notably
    David Woodhouse.
    
    Includes fix for position of stack arguments to external C functions
    when there are more than 8 parameters (RHBZ#829187).
    
    Includes fix for minor heap corruption because of unaligned minor heap
    register (RHBZ#826649).
    
    Includes updates for OCaml 4.01.0.
    
        
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