[PATCH, v2] Fix ARM machine state testcase failures

[Luis Machado]

Hi,

This is v2 of the original patch. Compared to v1, i've taken Yao's 
suggestion and dropped special handling of push/pop instructions.

While at it, i noticed the original functions had some issues like 
unused variables and broken identation, so i went ahead and completely 
rewrote the functions handling ARM mode opcodes 010 and 100.

I see the same results as before, with no regressions.

How does it look now?

Luis
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