[RFC] Variable Expansion Optimization

[Revital Eres]

Hello,

This patch implements the variable expansion optimization 
in the unroller as was described in 
http://gcc.gnu.org/ml/gcc/2004-08/msg00658.html.
It is missing the check for register pressure which is going to
be the next step.

The code contains the patch for splitting induction variables 
in unroller because it is not in mainline yet.
(http://gcc.gnu.org/ml/gcc-patches/2004-08/msg00397.html)
I also made some changes to it in 
order to support the variable expansion optimization.

Comments are welcome.

Thanks,
Revital


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