[PATCH] arm: move check for BX to its own header

[Bernhard Reutner-Fischer]

On Thu, Apr 11, 2013 at 11:02:03PM +0200, Yann E. MORIN wrote:
> As Will noticed, the header this check is currently done in
> is asm-only, and is not meant to be included from C code.
> This breaks compilation when compiled for a Thumb2-aware CPU.
> 
> Move the BX check to its own header, and revert 7a246fd.

Applied, thanks!