[PATCH] Move stuff to simplify-rtx.c, 4/13 - FLOAT_TRUNCATE

[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 FLOAT_TRUNCATE
simplifications to simplify-rtx.c.

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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