[PPC] Add an option to disable isel

[Olivier H Sallenave]

Hi,

As explained in http://reviews.llvm.org/D8260, using branches can give
speedups compared to using isel on P7 and P8. This patch adds the
-misel/-mno-isel option so that the user can tune its application. -misel
is the default.

(See attached file: clang-isel.diff)

Thanks,
Olivier
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