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1. For a constant where the high and low halves only differ by a few bits, consider using pack as an intermediate step and the Zbs instructions to make final adjustments.
2. When possible derive the upper and lower halves from a common sequence, so for example sharing a lui
3. Similarly for cases where the high half can be constructed by merely shifting the low half.
4. Improve handling of constants where the upper and lower 32bit halves are the same and zbkb is not available.  It is believed this is a relatively small adjustment to the existing code.

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