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

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

New page:
''' 'early_prop' ''' LIR transformation implements a simple algorithm of constant and copy propagation.
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It works only with operands which have single definitions. In addition to constants it also propagates heap reads.
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The main goal of the pass is to reduce register pressure.