ARM improvements for GCSE

[Maxim Kuvyrkov]

This patch improves handling of "J" and "K" constants.

If a pseudo assigned a constant and set only once, IRA/reload can 
rematerialize it to decrease high register pressure.

OK to check in?

-- 
Maxim Kuvyrkov
CodeSourcery
maxim@codesourcery.com
(650) 331-3385 x724
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