New SRA Implementation

[Jakub Staszak]

Hello,
During my internship in Novell I have been doing new SRA  
implementation based on flat memory. It's very simple and have to be  
improved in many places, however in some cases generates better code  
that the current one (e.g. it can scalarize unions).

It bootstraps trunk before IRA. After IRA there are some problems,  
Richi will write something more about this bug soon.

-- 
Jakub Staszak
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