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Add no-op handling for zero bits in lshift_prevent_overflow function#400

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trackoor wants to merge 1 commit intoBitVM:mainfrom
trackoor:fix/lshift-bits0-altstack
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Add no-op handling for zero bits in lshift_prevent_overflow function#400
trackoor wants to merge 1 commit intoBitVM:mainfrom
trackoor:fix/lshift-bits0-altstack

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Fix #399

…to prevent unnecessary altstack usage and added assertion for bits limit.
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lshift_prevent_overflow(bits = 0) empties/underflows altstack due to missing OP_TOALTSTACK pushes in limb shifters

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