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

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

New page:
''' 'spillgen' ''' - a basic-block local register allocator and spill generator.
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The global register allocator [:Jitirno_OPT/regalloc: regalloc] is responsible for method-level allocation of registers and does not guarantee that all of the constrains are satisfied.
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This transformation checks constrains for every instruction and generates basic block local spills if an instruction requires specific registers to be used and the registers are not free.