540d255167
This PR is to add vector reduction instructions according to https://llvm.org/docs/GlobalISel/GenericOpcode.html#vector-reduction-operations and widen in such a way a range of successful supported conversions, covering new cases of vector reduction instructions which IRTranslator is unable to resolve. By legalizing vector reduction instructions we introduce a new instruction patterns that should be addressed, including patterns that are delegated to pre-legalize step. To address this problem, a new pass is added that is to bring newly generated instructions after legalization to an aspect required by instruction selection. Expected overheads for existing cases is minimal, because a new pass is working only with newly introduced instructions, otherwise it's just a additional code traverse without any actions.
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