[PATCH] Fix mfcr for POWER targets other than POWER4

[Troy Rollo]

The patch at <http://sources.redhat.com/ml/binutils/2003-07/msg00094.html> 
introduced an alternative (faster) mfcr instruction for POWER4 targets, 
however the flags were changed on the old instruction so that it was no 
longer available when targeting POWER architectures other than POWER4.

You can see some of the problems this has caused by googling for "Unrecognized 
opcode mfcr".

The attached patch fixes this.
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