feat: add BitVec.signExtend_extractLsb_setWidth theorem #11943
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Co-authored-by: Tobias Grosser <github@grosser.es>
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LGTM, thanks! It took me a moment's thinking to see why this is true, so a comment would be appreciated :)
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This PR introduces the theorem
BitVec.sshiftRight_eq_setWidth_extractLsb_signExtendtheorem, provingx.sshiftRight nis equivalent to first sign-extendingx, extracting the appropriate least significant bits, and then setting the width back tow.