[LSR/LFTR] Move two utilities to common code for reuse [nfc]
We're working on a transform in LSR which is essentiall an inverse of LFTR (in certain sub-cases). Move utilties so that they can be reused.
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We're working on a transform in LSR which is essentiall an inverse of LFTR (in certain sub-cases). Move utilties so that they can be reused.