[PATCH] Make v7(e)m default to thumb

[Bernie Ogden]

Attached simple patch makes thumb the default for armv7m and armv7em. Given
that these targets don't support arm, this has to be a Good Thing.

Fixes http://llvm.org/bugs/show_bug.cgi?id=17559.

Note that this only fixes the clang side. M'colleague pointed out that other
LLVM tools (e.g. llc) are broken in this respect. I took a look at what
would be required to fix this and decided not to go there.

Please review.

Regards,

Bernie
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