[PATCH] Make the driver accept all four variants of the target option

[Gabor Ballabas]

In http://reviews.llvm.org/D7730#137539, @rengolin wrote:

> LGTM.


Hi Renato,

Thanks for the review. Could you land the patch for me?
I don't have commit rights.

Thanks,
Gabor


http://reviews.llvm.org/D7730

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