[PATCH] Enable -funroll-loops at -O3

[Andrew Pinski <pinskia at physics dot uc dot edu>]

This seems like something which we should do as it is a huge boost for 
most
code now.  C++ code gets the biggest benefit as we do unrolling on the 
tree
level and we can sometimes cause us not to store on the stack the 
calculation.
For -O2/-Os we should enable complete unrolling only if it is a size 
win but
I have not looked on doing that yet because there are a huge amount of 
C++
code which be helped by that.

OK? Bootstrapped and tested on powerpc-darwin with no regressions.

Thanks,
Andrew Pinski

ChangeLog:
	* opts.c (decode_options): Enable -funroll-loops at -O3 and above.

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