llvm2.7: force arm mode for now for armv4t
llvm2.7: force arm mode for now for armv4t

* http://llvm.org/bugs/show_bug.cgi?id=6065
* other archs are probably also affected, feel free to add
* it's not clear if it's thumb2 or thumb1 only, because arm920t
  is affected and woglinde said his armv7 machine is not affected

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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