[Harmony Wiki] Update of "Jitrino OPT/unroll" by Mikhail Fursov

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The following page has been changed by Mikhail Fursov:
http://wiki.apache.org/harmony/Jitrino_OPT/unroll

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- Loop unrolling expands the loop body by combining several iterations into one to reduce the loop overhead and to expand the scope for optimizations in the loop body.
+ ''' 'loop_unroll' ''' - unroll loops
+ [[BR]][[BR]]
+ Loop unrolling expands the loop body by combining several iterations into one removing intermediate loop-exit checks.
+ [[BR]]
+ The optimization reduces number of instructions executed per loop iteration and expands scope for optimizations inside of the loop body.