[patch] Fix darwin ppc DataLayout in clang.

[Rafael Espíndola]

This patch changes two things on the clang DataLayout strings for ppc darwin:

* The addition of f128:64:128, which was added on r40792 to the llvm
side for ppc-darwin and ppc64-darwin and is still there.
* The addition of f64:32:64 to ppc32-darwin. LLVM used to do this
before r134367, and it looks like that change was unintentional for
darwin. I was using that since at least r28414, which created the
DataLayout string :-)

Cheers,
Rafael
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