[bfin] Fix an bug in the implementation of hardware loop

[Jie Zhang]

There is a possible bug in the hardware loop code of bfin port. I
encountered an internal error when building our internal maintained
GCC 4.1 toolchain today, which has the hardware loop patch installed.
I traced down to a bug in hardware loop code. recog_memoized () should
only be called for a real instruction. This patch should fix it.

Is it OK?

Jie
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