[PATCH] Variable Expansion in unroller + Register Pressure Utility

[Revital Eres]

Hello,

Attached is the patch with the changes I was asked to make.

The testing so far on POWER4 showed no significant 
improvement on SPECINT.
On SPECFP I noticed an improvement of ~2.6% on art benchmark 
when running with POWER4 flags.
On i686 the patch showed no significant improvement
on both SPECINT and SPECFP.

The optimization is currently enabled 
with -fvariable-expansion-in-unroller flag.

Bootstrapped (with -funroll-all-loops) & regression tests on POWER4.
(I would also like to report that in the last two days (20-19/9/04)
I received gnucompare error when bootstraping
mainline with -O2 -funroll-all-loops options on both i686 and POWER4.)

Thanks,
Revital


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