Fix for PR14824: Optimization arm_ldst_opt inserts newly generated instruction vldmia at incorrect position

[Stepan Dyatkovskiy]

Hello!
Please consider patch in attachment as fix for PR14824: Optimization 
arm_ldst_opt inserts newly generated instruction vldmia at incorrect 
position.
Patch introduces memory operands tracking in 
ARMLoadStoreOpt::LoadStoreMultipleOpti. For each register it keeps the 
order of load operations as it was before optimization pass.
It is kind of deep improvement of fix proposed by Hao: 
http://llvm.org/bugs/show_bug.cgi?id=14824#c4
But it also tracks conflicts between different register classes (e.g. D2 
and S5).

-Stepan
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