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vectorizer default in 4.3.0 changes document missing


I noticed the gcc 4.3.0 changes document on the website does not 
mention that the vectorizer is now on by default in -O3.
Perhaps that should be added? It seems like an important noteworthy
change to me.

I'm not sure it applies to all architectures, but it applies to
x86 at least.

-Andi


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