[PATCH] Move stuff to simplify-rtx.c, 7/13 - MINUS

[Paolo Bonzini]

This patch is the one I had already sent, split into thirteen pieces.  I 
hope it's easier to review it.  This one moves MINUS simplifications to 
simplify-rtx.c, and removes those already performed by simplify_plus_minus.

The patch set was bootstrapped and regtested all in one, on 
powerpc-apple-darwin8.3.0 and i686-pc-linux-gnu.

Paolo
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