This patch fixes thumb1 size cost of small constants.

Currently, the cost of SET of a constant is set to zero, which is odd 
considering that it still takes one instruction to do the operation. 
The code for Thumb2 and ARM modes returns COSTS_N_INSNS (1) for similar 
case, so the patch makes Thumb1 cost agree with ARM and Thumb2 cost.

OK to check in?

Thank you,

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