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Backport da4c7cce2100a4e4f9276b4f17e260be47b53f41 from FFmpeg git:
> From: Mans Rullgard <mans@mansr.com>
> Date: Tue, 26 Jul 2011 11:23:43 +0000 (+0100)
>
> x86: fix build with gcc 4.7
>
> The upcoming gcc 4.7 has more advanced constant propagation
> resulting some inline asm operands becoming constants and thus
> emitted as literals, sometimes in contexts where this results
> in invalid instructions.
>
> This patch changes the constraints of the relevant operands
> to "rm" thus forcing a valid type. While obviously suboptimal,
> this is what older gcc versions already did, and there is no
> change to the code generated with these.
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