[rfc] PowerPC ABI detection and overrides

[Ulrich Weigand]

Daniel Jacobowitz wrote:

> Here's what I checked in.  This skips some of the tests when using ELF
> without ABI markings, but still runs enough to be useful - the tests
> fail in a way that's hard to XFAIL, since the generic ABI uses
> pass by reference so we end up with bad pointers.

This looks fine to me; I've tested on a native powerpc-linux (with an old
toolchain), without any FAILs.

Thanks,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com