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[PING] fwprop fixes


These two patches interact in interesting ways with the changes going on in dataflow-branch.  I propose both for mainline.


1) [PATCH] fix pr30841 part 2, df bug (mainline only)
http://gcc.gnu.org/ml/gcc-patches/2007-02/msg01797.html

This one is an avr performance regression whose root cause is a target-independent bug in df-*.c.  This bug has already fixed in the branch, so the patch is for mainline only; it can be simpler to wait for the dataflow-branch merge.

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2) [PATCH] fix pr30907, worse code produced when an address is forward propagated
http://gcc.gnu.org/ml/gcc-patches/2007-02/msg01802.html

This one is an i686 performance regression that is only present in the branch, because PR30841 hides it on the mainline.  I'd rather get this patch into mainline, however, and let the branch pick it up at the next merge.

Paolo


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